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
A child makes tower of 4 cubes at ? 
Select and explain. 
A. 1 year, B. 11/2 years, C. 3 years, D. 4years
B: 11/2 years
Answer: B: 11/2 years 
Explanation: Ans. is 'b' i.e., 11/2 years Age Number of cubes of tower 12 months 2 15 months 3 18 months 4 21 months 6 24 months 7 30 months 9 36 months 10