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
White leg is due to - 
Select and explain. 
A. Femoral vein thrombosis and lymphatic obstruction, B. Deep femoral vein thrombosis, C. Lymphatic obstruction only, D. None of the above
B: Deep femoral vein thrombosis
Answer: B: Deep femoral vein thrombosis 
Explanation: Ans. is 'b' i.e., Deep femoral vein thrombosis