Which of the following functions of the integumentary system is NOT correctly matched with an example?

A) sensation - pain, heat, cold, and pressure receptors in the skin
B) temperature regulation - radiation and convection of heat from blood flowing in the dermis
C) excretion - hydrogen ions are moved from the skin into the urine
D) vitamin D production - active vitamin D is produced from a precursor molecule
E) All of these are correctly matched.