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: Medicine
[{'content': 'Tietze syndrome involves swelling of \nSelect and explain. \nA. 1st Costochondral joint, B. 2nd or 3rd Costochondral joint, C. 4th & 5th Costochondral joint, D. 6th or 7th Costochondral joint', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Painful swelling of second or third Costo chondral joint.', 'role': 'assistant'}]