I take issue with your "correct" answer.
Q: Why do cows produce milk?
A: Because calves (baby cows) drink it.
Q: Why do cows produce milk?
A: Because calves (baby cows) drink it.
How do you escape from a perfectly sealed room with a table in it?
You run around the table until your legs are sore, use the saw to cut the table into two, two halves make a whole, you escape through the hole.