Question

Your skin is the largest organ of your body. The skin and its appendages, hair and nails, are known as the integumentary system. All BUT one of these are functions of your skin.
A) aids in the production of vitamin D
B) helps regulate your body temperature
C) first line of protection against invaders
D) semipermeable membrane to substances like glucose

Answer 1

I think its D

Answer 2

I think it is too.