Given an trivia question precisely answer the question with a word/phrase/name. External resources such as Wikipedia could be used to obtain the facts.

What word is used in mathematics to mean if and only if?
if and only if

Which former 'Have I Got News For You' presenter made an occassional appearance as Patrick in 'One Foot In The Grave'?
angus deayton

Which famous chemist was executed in the French Revolution?

antoine lavoisier