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': 'Following amputation of the coronal portion of the pulp\nof an immature permanent first molar the stump should\nbe capped with: \nSelect and explain. \nA. Formocresol, B. Calcium chloride, C. Thymol zinc oxide, D. Calcium hydroxide', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]