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': 'A flat discolouration on skin as 1 cm is called : \nSelect and explain. \nA. Macule, B. Plague, C. Boil, D. Papule', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A. i.e. Macule', 'role': 'assistant'}]