Please answer the following question: Determine the topic of the question-answer pair. Question: "when did thomas jefferson become president?";  Answer: "Thomas Jefferson (April 13, 1743 (April 2, 1743 O.S. ) – July 4, 1826) was an American Founding Father , the principal author of the Declaration of Independence (1776) and the third President of the United States (1801–1809)."? Topic:
A:
Thomas Jefferson