This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrine System, Subject name: Physiology
The anterior pituitary is mainly composed of the following secretory cells 
Select and explain. 
A. Somatotrope, B. Lactotrope, C. Thyrotrope, D. Coicotrope
A: Somatotrope
Answer: A: Somatotrope 
Explanation: Hormone - secreting cells of the human anterior pituitary gland. Cell Type hormones Secreted percentage of Total secretory Cells Somatotrope Growth hormone 50 Lactotrope Prolactin 10-30 Coicotrope ACTH 10 Thyrotrope TSH 5 Gonadotrope FSH, LH 20 ACTH, adrenocoicotropic hormone; FSH, follicle-stimulating hormone; LH, luteinizing hormone; TSH, thyroid-stimulating hormone.