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
All of the following are the high risk factors for DVT except: 
Select and explain. 
A. General urological surgery in patient >40 years, B. Extensive pelvic or abdominal surgery, C. Major ohopaedic surgery of lower limbs, D. Surgery lasting for >=30 minutes
D: Surgery lasting for >=30 minutes
Answer: D: Surgery lasting for >=30 minutes 
Explanation: Risk of DVT in Relation to age and duration of surgery High risk Moderate risk Low risk General urological in patients > 40 years Extensive pelvic or abdominal surgery Major ohopaedic surgery of lower limbs General surgery in patients >= 40 years Surgery lasting for >= 30 minutes General surgery in patients < 40 years on OCPs Uncomplicated surgery in patients < 40 years without additional risk Minor surgery (<30 minutes) in patients < 40 years additional risk