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: Surgery
In occult filariasis, all are true except 
Select and explain. 
A. Microfilaria is demonstrable in blood, B. Microfilaria is demonstrable in lungs, C. Eosinophilia present, D. Thrombophlebitis can occur
A: Microfilaria is demonstrable in blood
Answer: A: Microfilaria is demonstrable in blood 
Explanation: In occult filariasis, microfilaria is not demonstrable in blood.