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: Dental
[{'content': 'In a 3yr old patient the cement used after pulpectomy is: \nSelect and explain. \nA. Ca(OH)2, B. ZOE, C. Ca (OH)2 + CMCP, D. Active transport', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]