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
Tietze syndrome involves swelling of 
Select and explain. 
A. 1st Costochondral joint, B. 2nd or 3rd Costochondral joint, C. 4th & 5th Costochondral joint, D. 6th or 7th Costochondral joint
B: 2nd or 3rd Costochondral joint
Answer: B: 2nd or 3rd Costochondral joint 
Explanation: Painful swelling of second or third Costo chondral joint.