This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
[{'content': 'The most common hormone other than gastrin, contained in the gastric - secreting islet cell tumour is - \nSelect and explain. \nA. ACTH, B. Glucagon, C. Growth hormone releasing factor, D. Insulin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]