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': 'All are seen in cyst of E.Histolytica except ? \nSelect and explain. \nA. Glycogen mass, B. Chromatid bars, C. Eccentric nucleus, D. Refractile nucleus', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Refractile nucleus . The early cyst contains a single nucleus and two other structures - a mass of glycogen and one to four chromatid bodies.", 'role': 'assistant'}]