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
The pathogenicity of Entamoeba histolytica is indicated by - 
Select and explain. 
A. Zymodeme pattern, B. Size, C. Nuclear pattern, D. ELISA test
A: Zymodeme pattern
Answer: A: Zymodeme pattern 
Explanation: Cultures are not used routinely but may on occasion prove positive in cases found negative by microscopy. Cultures permit the determination of zymodeme patterns for differentiation between pathogenic and nonpathogenic strains. TEXTBOOK OF MEDICAL PARASITOLOGY,CKJ PANIKER,6TH EDITION,PAGE NO 25