This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pediatrics, Subject name: Social & Preventive Medicine
[{'content': 'Denominator of infant mortality rate is? \nSelect and explain. \nA. Per live birth, B. per 100 live births, C. Per 1000 live births, D. Per lakh live births', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) Per 1000 live birthsRef: Park 20thed./488', 'role': 'assistant'}]