Which of the Following Statements Is True

Which of the following statements is true?

A) Although hormones are carried to all parts of the body, they produce effects only in cells with proper receptors.
B) Hormones are limited to steroid compounds.
C) Hormones are secreted by specialized exocrine glands.
D) Most hormones are controlled by positive feedback mechanisms involving the pituitary gland.
E) Hormones are supplied to the body in the diet.