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
The most distinctive feature of pathogenic E. histolytica on fresh stool examination is: 
Select and explain. 
A. Presence of active pseudopodia, B. Erythrophagocytosis, C. Presence of intracytoplasmic vacuole, D. Presence of two nucleoli
B: Erythrophagocytosis
Answer: B: Erythrophagocytosis 
Explanation: 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.