This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: parasitology, Subject name: Microbiology
[{'content': 'The mature cyst of Entamoeba histolytica differs from Entamoeba coli, in the following except- \nSelect and explain. \nA. Size 6 to 15 microns, B. Nuclei are 1 to 4 in number, C. Karyosome is central in position, D. Chromatid bars seen', 'role': 'user'}, {'content': 'Answer: D \nExplanation: cyst E.histolytica E.coli size 6-15micrometre 15-20 micrometre nucleus 1 to 4,central karyosome 1 to 8 ,eccentric karyosome chromatid bars rounded filamentous TEXTBOOK OF MEDICAL PARASITOLOGY,BAVEJA,3RD EDITION,PAGE NO 22', 'role': 'assistant'}]