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
Which one of the following dental cement accelerates the formation of reparative dentin? 
Select and explain. 
A. Eugenol, B. Calcium hydroxide, C. Zinc oxide, D. Silica
B: Calcium hydroxide
Answer: B: Calcium hydroxide 
Explanation: BIOLOGICAL PROPERTIES OF Ca(OH)2 :
Effect on pulp:
The cement is alkaline in nature. The high pH is due to the presence of free Ca(OH)2 in the set cement. The pH ranges from 9.2 to 11.7
Formation of secondary dentin: 
The high alkalinity and its consequent antibacterial and protein lysing effect helps in the formation of reparative dentin.
Ref: Mannapalli ed 3  pg 80