This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autoimmune Skin Disorders, Subject name: Skin
[{'content': 'A 35-year-old man developed a brown pigmentation on the face after taking nonsteroidal anti-inflammatory drug (NSAID) for fever, joint pain and malaise. What is the diagnosis? \nSelect and explain. \nA. Dengue fever, B. Chikungunya, C. Fixed drug eruption, D. Melasma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: ANS. C* The image shows a hyperpigmented lesion, and with the history of drug intake, the diagnosis is fixed drug eruption.Close differentials of hyperpigmented lesions in faceMelasma (brown pigmentation in face)', 'role': 'assistant'}]