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': 'In IMR, age of infants is considered - \nSelect and explain. \nA. Below 1 month, B. Below 1 year, C. Upto 1 year, D. 28 days', 'role': 'user'}, {'content': "Answer: B \nExplanation: Infant moality rate is the deaths of children less than 1 year of age on a year per number of live bihs in the same year X 100REF. PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICAL 21ST EDITION. PAGE NO - 523", 'role': 'assistant'}]