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
[{'content': 'Poly dimethyl siloxane based sealer \nSelect and explain. \nA. AH26, B. AH plus, C. Epiphany, D. Gutta flow', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Gutta flow and Roeko seal are silicone based sealers all others are resin based sealers.', 'role': 'assistant'}]