This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Gynaecology & Obstetrics
[{'content': 'Schwangershaft protein is the other name of : \nSelect and explain. \nA. hCG, B. Papp-1, C. Pregnancy specific beta1 glycoprotein, D. Activin', 'role': 'user'}, {'content': "Answer: C \nExplanation: PREGNANCY SPECIFIC b-1 GLYCOPROTEIN (PS b-1 G): It is produced by the trophoblast cells. It can be detected in the maternal serum 18-20 days after ovulation. PS b-1 G is a potent immunosuppressor of lymphocyte proliferation and prevents rejection of the conceptus. Reference: Dutta's Textbook of Obstetrics 7th edition page 61", 'role': 'assistant'}]