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: Gynaecology & Obstetrics
[{'content': 'Insulin is secreted by the fetal pancreas by : \nSelect and explain. \nA. 12th Week, B. 28th Week, C. 32th Week, D. 38th Week', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 12th Week', 'role': 'assistant'}]