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: This protein appears as early as three days following feilisation in maternal blood and is developed as a test for early detection and monitoring of pregnancy.', 'role': 'assistant'}]