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
The most distinctive feature of pathogenic Entamoeba 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: Ans. is 'b' i.e., Erythrophagocytosis . The presence of red blood cells in the cytoplasm (erythrophagocytosis) is diagnostic of E. histolytica as it is the only intestinal amoeba to exhibit this characteristic.