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: Dental
[{'content': 'According to the WHO classification of Periradicular  diseases periapical abscess with sinus to the oral cavity is coded as: \nSelect and explain. \nA. K04.60, B. KO4.61, C. K04.62, D. KO4.63', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]