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: Anatomy
[{'content': 'Manubriosternal joint is ? \nSelect and explain. \nA. Primary cailaginous, B. Secondary caritilaginous, C. Synol, D. Ellipsoid', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Secondary cailaginous", 'role': 'assistant'}]