Margaret Hilda Thatcher, Baroness Thatcher, (; 13 October 1925 - 8 April 2013) was a British stateswoman, who served as Prime Minister of the United Kingdom from 1979 to 1990 and as Leader of the Conservative Party from 1975 to 1990. In 1975, Thatcher defeated Heath in the Conservative Party leadership election to become Leader of the Opposition and became the first woman to lead a major political party in the United Kingdom. She resigned as Prime Minister and party leader in November 1990, after Michael Heseltine launched a challenge to her leadership. The United Kingdom general election of 1979 was held on 3 May 1979 to elect 635 members to the British House of Commons. The Conservative Party, led by Margaret Thatcher, ousted the incumbent Labour government of James Callaghan with a parliamentary majority of 43 seats.
Margaret Thatcher led a major political party in the United Kingdom.
Assess the veracity of the claim based on the provided evidence.

Claim: Margaret Thatcher led a major political party in the United Kingdom.

Evidence: Margaret Hilda Thatcher, Baroness Thatcher, (; 13 October 1925 - 8 April 2013) was a British stateswoman, who served as Prime Minister of the United Kingdom from 1979 to 1990 and as Leader of the Conservative Party from 1975 to 1990. In 1975, Thatcher defeated Heath in the Conservative Party leadership election to become Leader of the Opposition and became the first woman to lead a major political party in the United Kingdom. She resigned as Prime Minister and party leader in November 1990, after Michael Heseltine launched a challenge to her leadership. The United Kingdom general election of 1979 was held on 3 May 1979 to elect 635 members to the British House of Commons. The Conservative Party, led by Margaret Thatcher, ousted the incumbent Labour government of James Callaghan with a parliamentary majority of 43 seats.

Options: 

 - supported

 - refuted

 - not enough information
not enough information
Assess the veracity of the claim based on the provided evidence.

Claim: Margaret Thatcher led a major political party in the United Kingdom.

Evidence: Margaret Hilda Thatcher, Baroness Thatcher, (; 13 October 1925 - 8 April 2013) was a British stateswoman, who served as Prime Minister of the United Kingdom from 1979 to 1990 and as Leader of the Conservative Party from 1975 to 1990. In 1975, Thatcher defeated Heath in the Conservative Party leadership election to become Leader of the Opposition and became the first woman to lead a major political party in the United Kingdom. She resigned as Prime Minister and party leader in November 1990, after Michael Heseltine launched a challenge to her leadership. The United Kingdom general election of 1979 was held on 3 May 1979 to elect 635 members to the British House of Commons. The Conservative Party, led by Margaret Thatcher, ousted the incumbent Labour government of James Callaghan with a parliamentary majority of 43 seats.

Options: 

 - supported

 - refuted

 - not enough information
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