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': 'Gravindrex test can detect pregnancy in: MAHE 12 \nSelect and explain. \nA. 2 weeks, B. 4 weeks, C. 8 weeks, D. 12 weeks', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. 2 weeks', 'role': 'assistant'}]