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: Pathology
[{'content': 'Patches are circumscribed, flat lesion distinguished  from  surrounding skin, size of which is greater than \nSelect and explain. \nA. 1 mm, B. 2.5 mm, C. 5 mm, D. 10 mm', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Size of macule is less than 5 mm or less.\nSize of patch is\xa0 greater than 5 mm.', 'role': 'assistant'}]