Riddle

I'm the source of all emotion, but I'm caged in a white prison.

Choose an answer

A.Brain
B.Soul
C.Lungs
D.Heart
Hint: It's a word with 5 letters, starting with "H".

Answer

Heart

Why this is the answer

The heart is often said to be the seat of emotion, enclosed and protected within the white cage of the ribs.

This riddle is filed under Hard/Difficult Riddles and rated Medium.