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: Skin
[{'content': 'Reliable test for chancroid detection- \nSelect and explain. \nA. Skin test, B. Biopsy, C. Grams stained smear, D. Clinical examination', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Grams stained smear', 'role': 'assistant'}]