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: Unknown
[{'content': 'Riehl’s melanosis involves \nSelect and explain. \nA. Face and neck, B. Trunk, C. Extremities, D. Palms only', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Riehl’s melanosis (pigmented contact dermatitis) involves face and neck', 'role': 'assistant'}]