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: Pediatrics
[{'content': 'Gender from external genitalia of foetus becomes clearly distinguished by – \nSelect and explain. \nA. 10 weeks, B. 16 weeks, C. 12 weeks, D. 20 weeks', 'role': 'user'}, {'content': 'Answer: A \nExplanation: External genitals are distinguishable by 10th week of fetal life.', 'role': 'assistant'}]