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
Preterm infant is defined as - 
Select and explain. 
A. Born between 37-42 weeks, B. Born > 42 weeks, C. Born < 37 weeks, D. Born <25 weeks
C: Born < 37 weeks
Answer: C: Born < 37 weeks 
Explanation: 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