This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Parasitology Pa 1 (Protozoology), Subject name: Microbiology
[{'content': 'The most distinctive feature of pathogenic E. 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: The trophozoites from acute dysentric stools often contain phagocytosed erythrocytes. This feature is diagnostic and distinctive as phagocytosed red cells are not found in any other commensal intestinal amoebae.', 'role': 'assistant'}]