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': 'Prognosis of Gestational Trophoblastic Disease depends on all, except : \nSelect and explain. \nA. Number of living children, B. Blood group, C. Parity, D. Previous HCG titre', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. is a i.e. Number of living children', 'role': 'assistant'}]