This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Growth, Development, and Behavior, Subject name: Pediatrics
A 40-week-old infant can do all the following except: 
Select and explain. 
A. Waves bye bye, B. Transfer object from one hand to another, C. Sits without support, D. Makes a tower of 3-4 cubes
D: Makes a tower of 3-4 cubes
Answer: D: Makes a tower of 3-4 cubes 
Explanation: d. Makes a tower of 3--4 cubes(Ref: Nelson's 20/e p 65-77, Ghai 8/e p 52-54)40 week old infant is around 10 months old; Tower of 3-4 cubes comes by around 18 months age.