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': 'The most distinctive feature of pathogenic Entamoeba histolytica on fresh stool examination is \nSelect and explain. \nA. Presence of active pseudopodia, B. Erythrophagocytosis, C. Presence of intracytoplasmic vacuole, D. Presence of two nucleoli', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]