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': 'Most common oral manifestation of HIV infection is \nSelect and explain. \nA. Oral hyperpigmentation, B. Oral hairy leukoplakia, C. Oral candidiasis, D. Bacillary angiomatosis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]