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': 'The rest seat for a lingual rest is \nSelect and explain. \nA. Triangular shaped, B. Round shaped, C. V-Shaped, D. Oval Shaped', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]