instruction:
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.
question:
Although courted by his political opponent, Stephen Douglas, Mary Todd chose to marry which future American president?
answer:
abraham lincoln

question:
What did James Naismith invent in 1891?
answer:
basketball

question:
Pinchbeck is an alloy of copper and which other metal?
answer:
zinc