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: Gynaecology & Obstetrics
[{'content': 'Which of the following is true regrading hCG: September 2010 \nSelect and explain. \nA. Half-life is around 7 days, B. Low levels are seen in hydatidiform mole, C. HCG can be detected as early as 8-9 days after conception, D. All of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C: HCG can be detected as early as 8-9 days after conception', 'role': 'assistant'}]