<prompt> Hypothyroidism is caused by which of the following anti-tubercular drug -PASEthionamideCycloserinePyrazinamide  <response>: Ans. is a i.e., PAS Adverse effects of para-amino salicylic acid PAS -- Anorexia, nausea, epigastric pain, rashes, goiter hypothyroidism, fever, malaise, liver dysfunction, and blood dyscrasias. Adverse effects of ethionamide :Anorexia, nausea, vomiting, abdominal pain, hepatitis, optic or peripheral neuritis, metal disturbances and blood dyscrasias. 