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
Poly dimethyl siloxane based sealer 
Select and explain. 
A. AH26, B. AH plus, C. Epiphany, D. Gutta flow
D: Gutta flow
Answer: D: Gutta flow 
Explanation: Gutta flow and Roeko seal are silicone based sealers all others are resin based sealers.