You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

[Q]: Category: THE CALENDAR 
Clue: It's the 5th month mentioned in the rhyme that begins, "Thirty days hath..."
[A]: february


[Q]: Category: U.S. STAMPS 
Clue: FDR's in 1982 was the last stamp to show 1 of these; they were removed from photos of Jackson Pollock & Edward R. Murrow
[A]: cigarette


[Q]: Category: EXPLORERS 
Clue: In 1871 he answered, "Yes, and I feel thankful that I am here to welcome you"
[A]:
dr. livingstone