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: Social & Preventive Medicine
[{'content': 'Savalon contains: \nSelect and explain. \nA. Cetrimide + chlorhexidine, B. Cetavlon + cetrimide, C. Cetrimide + chlorhexidine + Butyl alcohol, D. Chlorhexidine + Butyl alcohol', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Cetrimide + chlorhexidine', 'role': 'assistant'}]