Which politician, the first woman to hold the office, served as Prime Minister from 1979 to 1990 and led three consecutive election victories?

• A Margaret Thatcher ✓
• B Theresa May
• C Harriet Harman
• D Barbara Castle

Margaret Thatcher was the longest-serving prime minister of the twentieth century and the first woman to hold the office; her free-market policies are collectively termed Thatcherism.