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
[{'content': 'Which one of the following activities cannot be formed by a 7 month old infant- \nSelect and explain. \nA. Pivot, B. Cruise, C. Transfer objects, D. Enjoy mirror', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Cruise", 'role': 'assistant'}]