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 15 years old boy presents with loose motions and intermittent abdominal pain over the past 1 year. Wet mount stool specimen showed the presence of multiple ova, which are more than 100 p in diameter. The causative organism for the disease shall not include: 
Select and explain. 
A. Fasciola gigantica, B. Gastrodiscoides hominis, C. Echinostoma ilocanum, D. Opistorchis viverrini
D: Opistorchis viverrini
Answer: D: Opistorchis viverrini 
Explanation: Answer- D (Opistorchis viverrini)Inhabit the bile duct of fish eating animalsCaused by ingestion of raw or under cooked freshwater fishAbdominal discomfo, gasFatigue is typicalAssociated with bile duct cancer