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': 'False about HCG are all except : \nSelect and explain. \nA. Lipoprotein, B. Radioimmunoassay > 6 days of conception, C. Secreted by corpus luteum, D. Non specific a and specific b - subunit', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Non specific a and specific b - subunit', 'role': 'assistant'}]