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': 'Preterm infant is defined as - \nSelect and explain. \nA. Born between 37-42 weeks, B. Born > 42 weeks, C. Born < 37 weeks, D. Born <25 weeks', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Preterm is defined as babies born alive before 37 weeks of pregnancy are completed. Subcategories include- 1. Extremely preterm is less than 28 wks 2. Very preterm 28 to 32 wks 3. Moderate to late preterm 32 to 37 wks Reference Park&;s textbook of preventive and social medicine 23rd edition pg 536', 'role': 'assistant'}]