This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Venous Disorders, Subject name: Surgery
The most common cause of superficial thrombophlebitis is: 
Select and explain. 
A. Intravenous catheters/infusion, B. DVT, C. Varicose veins, D. Trauma
A: Intravenous catheters/infusion
Answer: A: Intravenous catheters/infusion 
Explanation: SUPERFICIAL THROMBOPHLEBITIS This is a superficial venous thrombosis, most commonly caused by infusions of IV fluids Causes of Superficial Thrombophlebitis Venepuncture and IV infusion (MC) Trauma (especially to varicose veins) Buerger's disease Malignancy (Pancreas)