This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fetus & New Born and their Diseases, Subject name: Gynaecology & Obstetrics
[{'content': 'IUGR is defined when: \nSelect and explain. \nA. Birth weight is below the tenth percentile of the average of gestational age, B. Birth weight is below the 20 percentile of the average of gestational age, C. Birth weight is below the 30 percentile of the average of gestational age, D. Weight of baby is less than 1000 gm', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. is a, i.e. Birth weight is below the tenth percentile of the average of gestational ageRef Dutta Obs. 7/e, p 461Intrauterine growth restriction is said to be present in those babies whose birth weight is below the tenth percentile of the average for the gestational age.', 'role': 'assistant'}]