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
[{'content': 'A 7 year old presented with intermittent abdominal cramps, loose stool and on stool examination eggs of size 100 m are seen, which is not the cause ? \nSelect and explain. \nA. Fasciola gigantica, B. Echinostoma iliocanum, C. Gastrodiscoides hominis, D. Opisthorcis viverni', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is. 'd' i.e., Opisthorcis viverni Eggs of Opisthorcis viverni have size very much less than 100 m", 'role': 'assistant'}]