Riddle

I'm really blue, but when you see me I'm red. You don't see me too often. I'm there for you if you're hurt, but I'm good for you. What am I?

Choose an answer

A.Skin
B.A bruise
C.A vein
D.Blood
Hint: It's a word with 5 letters, starting with "B".

Answer

Blood

Why this is the answer

Blood inside your veins looks bluish through the skin, but once it's exposed to air (when you're cut) it turns red; it helps heal you when you're hurt.

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