Riddle

It covers you, you lose it every day and you'd die without it.

Choose an answer

A.Hair
B.Clothing
C.Blood
D.Skin
Hint: It's a word with 4 letters, starting with "S".

Answer

Skin

Why this is the answer

Skin cells constantly shed and regenerate every day, and skin itself is essential for survival.

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