This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Growth and development, Subject name: Pediatrics
[{'content': 'A normally developing 10 months old child should be able to do all of the following except _________ \nSelect and explain. \nA. Stand alone, B. Play peak to boo, C. Pick up a pellet with thumb and index finger, D. Build a tower of 3-4 cubes', 'role': 'user'}, {'content': 'Answer: D \nExplanation: the child is able to make tower of 2 blocks by 15 months and tower of 3 blocks by 18 months. Ref: OP GHAI - ESSENTIAL PEDIATRICS - 8 TH edition page no 50', 'role': 'assistant'}]