Which of the following statements about hormones is correct?
A. All hormones secreted by the anterior and posterior pituitary glands are peptides.
B. Anterior pituitary hormones are synthesized in the hypothalamus.
C. Only steroid hormones can regulate the secretion of steroid hormones.
D. All of the hypophysiotropic hormones are peptides.
E. IGF-1 stimulates growth by increasing growth hormone secretion through positive feedback.
Answer: A
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