This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Deep vein thrombosis is more common after \nSelect and explain. \nA. Prostatic operation, B. Total hip replacement, C. Neurosurgery, D. Gastrectomy', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The factors which result in increased risk of venous thrombosis include advancing age and greater complexity of surgical treatment. Ohopedic operations on the lower limbs (hip and knee replacements) are especially likely to result in venous thrombosis." - Bailey & Love Ref : Bailey & Love 24/e p969', 'role': 'assistant'}]