This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
[{'content': "Castellani's paint contains all of the following except \nSelect and explain. \nA. Basic fuchsin, B. Phenol, C. Benzene hexachloride, D. Boric acid", 'role': 'user'}, {'content': "Answer: C \nExplanation: Castellani's paint is used to disinfect skin and to treat 'fungus infections of the skin. Its components are phenol, resorcinol, basic fuchsin, boric acid, and acetone.", 'role': 'assistant'}]