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: Surgery
[{'content': 'Injection sclerotherapy is ideal for the following- \nSelect and explain. \nA. External haemorrhoids, B. Internal haemorrhoids, C. Posterior resection, D. Local resection', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]