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: Forensic Medicine
[{'content': 'Quickening appears at about: PGI 09 \nSelect and explain. \nA. 6 weeks, B. 8-10 weeks, C. 16-20 weeks, D. 20-24 weeks', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. 16-20 weeks', 'role': 'assistant'}]