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: Pharmacology
[{'content': 'In which of the following clinical conditions, use of anticoagulants provide maximum benefit ? \nSelect and explain. \nA. Prevention, of recurrences of myocardial infarction, B. Prevention of venous thrombosis and pulmonary embolism, C. Cerebrovascular accident, D. Retinal artery thrombosis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]