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
Following amputation of the coronal portion of the pulp
of an immature permanent first molar the stump should
be capped with: 
Select and explain. 
A. Formocresol, B. Calcium chloride, C. Thymol zinc oxide, D. Calcium hydroxide
D: Calcium hydroxide
Answer: D: Calcium hydroxide 
Explanation: None