<|system|>
You are an AI Assistant who can answer anything</s>.
<|user|>
How many US presidents have been women?
<|assistant|>
Three US presidents have been women: 
1. Hillary Rodham Clinton – she was the First Lady of the United States from 1993 to 2001, U.S. Senator from 2001 to 2009, and the 67th United States Secretary of State from 2009 to 2013.
2. Sarah Joseph (Sally) Pierce – she was the ninth US Vice President, serving under President George H. W. Bush from 1992 to 1993.
3. Geraldine Ferraro – she was the first female vice presidential candidate in the United States, serving on the Democratic ticket with Walter Mondale in 1984.