This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: obstetrics,pediatrics and geriatrics, Subject name: Social & Preventive Medicine
[{'content': 'All are common causes of maternal moality except - \nSelect and explain. \nA. Post-paum hemorrhage, B. Infection, C. Cardiac failure, D. Anaemia', 'role': 'user'}, {'content': "Answer: C \nExplanation: Cardiac failure us not a common cause of maternal moality. REF. PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICAL 21ST EDITION. PAGE NO-516", 'role': 'assistant'}]