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
The base paste of the condensation poly silicone has a low molecular weight dimethyl siloxane with a terminal-group 
Select and explain. 
A. Mercaptan group, B. Hydroxyl group, C. Silane group, D. Vinyl group
B: Hydroxyl group
Answer: B: Hydroxyl group 
Explanation: None