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': "Riehl's melanosis mainly invloves ? \nSelect and explain. \nA. Face and Neck, B. Trunk, C. Extremities, D. Palms only", 'role': 'user'}, {'content': 'Answer: A \nExplanation: A. i.e. Face & Neck', 'role': 'assistant'}]