This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
[{'content': 'Gender of the fetus is first evident by what gestational age (weeks) ? NOT RELATED - GYN \nSelect and explain. \nA. 6, B. 8, C. 12, D. 16', 'role': 'user'}, {'content': 'Answer: C \nExplanation: .', 'role': 'assistant'}]