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: Physiology
[{'content': 'In a foetus, thyroxine secretion begins by? \nSelect and explain. \nA. 3rd month, B. 8th week, C. 10th to 12th weeks, D. 9th month', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Thyroxine secretion begins by 10th to 12th weeks. Glucagon secretion begins by 8th week. Insulin containing granules can be identified in the human foetal pancreas by 9 to 10 weeks. and insulin in foetal plasma is detectable at 12 weeks. Ref: Williams Obstetrics, 22/e, Page 108 ; Dutta Obstetrics 6/e, Page 43', 'role': 'assistant'}]