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': "Based on Bokenkamp's grading of enlargements, an enlargement covering 3/4th of the crown is considered as \nSelect and explain. \nA. Grade I, B. Grade II, C. Grade III, D. Grade IV", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]