This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Monitoring in Anesthesia, Subject name: Anaesthesia
Commonest complication of subclan venous puncture is 
Select and explain. 
A. Infection, B. Pneumothorax, C. Carotid aery puncture, D. Atrial perforation
B: Pneumothorax
Answer: B: Pneumothorax 
Explanation: Pleura being in close proximity subclan cannulation has high incidence of pneumothorax other common problem is malposition of catheter due to its touous course.