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': 'Which of the following will give Medusa head colony on x-ray - \nSelect and explain. \nA. Hook worm infestation, B. Round worm infestation, C. Tenia solium infestation, D. a + b', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans is 'b' ie. Round worm infestation I have looked in Chapman, Sutton, Sabiston, and Schwaz without any success. Residents do not know about it (Only God Knows)", 'role': 'assistant'}]