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': 'Which of the portions of the intra articular disc is the thinnest? \nSelect and explain. \nA. Anterior, B. Intermediate, C. Posterior, D. Retrodiscal', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]