Riddle

What force and strength cannot get through, I with my unique teeth can do. What am I?

Choose an answer

A.A crowbar
B.A lever
C.A drill
D.Key
Hint: It's a word with 3 letters, starting with "K".

Answer

Key

Why this is the answer

A locked door can't be forced open by strength alone, but the key's unique cut ('teeth') opens it easily.

This riddle is filed under "What Am I?" Riddles and rated Medium.