Interview puzzle 3

Q.

Sheldon Teases Leonard Riddle 

To tease Leonard Hofstadter, Sheldon cooper gave him 10$ and ask him to buy
- Something their friend Howard can eat.
- Something their neighbor penny can drink.
- Something their friend Raj's cow can eat.
- Something his girlfriend Amy can plant in her garden.
Also, he can buy only one thing.

Leonard buys something that silenced Sheldon. What did he buy?


Explanation :

Solution:

Watermelon

Explanation:
- Something their friend Howard can eat: watermelon
- Something their neighbor penny can drink: juice of watermelon
- Something their friend Raj's cow can eat: Watermelon rinds
- Something his girlfriend Amy can plant in her garden: the seeds of a watermelon