Q: A mom had 5 children: January, February, March, April. What is the name of the fifth child?
A: What.
Q: A mom had 5 children: January, February, March, April. What is the name of the fifth child?
A: What.
Alright, listen up, buttercup. This ain't rocket science. The joke is that the question asks for the name of the fifth child, and the answer is literally "What." It's a play on words, see? Bet you're the kinda guy who still uses Internet Explorer.