This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
[{'content': 'Savlon contains \nSelect and explain. \nA. Cetrimide + Chlorhexidine, B. Cetrimide + Chlorhexidine + butyl alcohol, C. Cetrimide + butyl alcohol, D. Cetrimide + cetavlon', 'role': 'user'}, {'content': "Answer: A \nExplanation: Savlon is a combination of cetavlon and hibitane. Plastic appliances can be disinfected by keeping them in normal strength savlon for 20 minutes. Savlon 1 in 6 spirit is more effective than savlon in 1 in 20 aquous solution Ref: 25th edition, Park's Textbook of Preventive and Social Medicine, Page no. 141", 'role': 'assistant'}]