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: Surgery
Paget-Schroetter syndrome is 
Select and explain. 
A. Primary lower limb DVT, B. Primary upper limb DVT, C. Femoral vein compression, D. Pelvic vein compression
B: Primary upper limb DVT
Answer: B: Primary upper limb DVT 
Explanation: Primary upper limb deep vein thrombosis is Paget Schroetter syndrome is due to subclavian vein compression that occurs in thoracic outlet syndrome.