Assertion (A): Woollen clothes keeps us warm.
Reason (R): Woollen fibres are made from a special type of protein, which is a bad conductor of heat.
Select the correct answer:

A. Both (A) and (R) are true and (R) is the correct explanation of (A)

B. Both (A) and (R) are true, but (R) is not the correct explanation of (A)

C. (A) is true, but (R) is false

D. (A) is false, but (R) is true

Answer: Option C