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
[{'content': 'All of the following are the high risk factors for DVT except: \nSelect and explain. \nA. 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', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 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', 'role': 'assistant'}]