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: Radiology
[{'content': 'Late Complication of radiotherapy \nSelect and explain. \nA. Nausea, B. Thrombocytopenia, C. Mucositis, D. Erythema', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Mucositis (Inflammation of mucosa) is a late complication.', 'role': 'assistant'}]