This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T., Subject name: Medicine
The most common hormone other than gastrin contained in the gastric secreting islet cell tumour is: 
Select and explain. 
A. ACTH, B. Glucagon, C. Melanocyte stimulating hormone, D. Growth hormone releasing factor
A: ACTH
Answer: A: ACTH 
Explanation: Ans: aRef: Harrison, 14th ed, p. 1613