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': 'Most common cause of infant morntality? \nSelect and explain. \nA. LBW, B. Injury, C. A, D. Tetanus', 'role': 'user'}, {'content': "Answer: C \nExplanation: Most common cause of Infant moality is upper respiratory tract diseases. REF. PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICAL 21ST EDITION. PAGE NO - 522", 'role': 'assistant'}]