This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
90% of brain growth is achieved by the - 
Select and explain. 
A. 2nd year, B. 3rd year, C. 5th year, D. 15th year
A: 2nd year
Answer: A: 2nd year 
Explanation: Ans. is 'a' i.e., 2nd year o The brain enlarges rapidly during the latter months of fetal life and early months of postnatal life. o At bih, the head size is about 65 to 70 percent of the expected head size in adults. o It reaches 90 percent of the adult head size by the age of 2 years.