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': 'Gingival sulcus is V shaped and it barely permits the entrance of a \nSelect and explain. \nA. Periodontal hoe, B. Periodontal curette, C. Periodontal probe, D. Periodontal sickle', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]