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
A company executive, who travels world wide, presents with upper abdominal mass and + ve casoni's test. The organism is - 
Select and explain. 
A. Echinococcus, B. Entamoeba histolytica, C. Hepatitis, D. Ascariasis
A: Echinococcus
Answer: A: Echinococcus 
Explanation: None