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
Impression material of choice in patients with oral submucous ﬁbrosis is: 
Select and explain. 
A. ZOE paste, B. Addition silicone, C. Condensation silicone, D. Impression plaster
B: Addition silicone
Answer: B: Addition silicone 
Explanation: In OSMF patients as the mucosa is fibrosed, one needs to take proper care during impression:

ZOE would be irritating to fibrosed tissues.
Impression plaster has poor handling properties and flow.
Condensation silicone is dimensionally less stable than addition silicone due to by-product formation.
Addition silicone is the best suited material due to its dimensional stability, flow and handling properties. It is non-irritating to the tissues.