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': 'To make the vinyl polysiloxane hydrophilic the following is added: \nSelect and explain. \nA. Mineral oil, B. Surfactant, C. Water, D. Plasticizer', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]