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: Microbiology
[{'content': 'Which of the following produces bile stained eggs ? \nSelect and explain. \nA. Ankylostoma duodenale, B. Taenia solium, C. Enterobius vermicularis, D. Necator americanus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]