This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable & Non Communicable Disease, Subject name: Social & Preventive Medicine
All of the following are helminthic water born disease except? 
Select and explain. 
A. Roundworm, B. Threadworm, C. Hydatid cyst, D. Giardiasis
D: Giardiasis
Answer: D: Giardiasis 
Explanation: Giardiasis is water born protozoal infection A. Biological (Water-borne diseases) Those caused by the presence of an infective agent:- a. Viral: Viral hepatitis A, hepatitis E, poliomyelitis, rotavirus diarrhea in infants b. Bacterial : Typhoid and parathyphoid fever, bacillary dysentery, Esch. coli diarrhea, cholera c. Protozoal: Amoebiasis, giardiasis d. Helminthic: roundworm, threadworm, hydatid disease. e. Leptospiral: Weil's disease 2. Those due to the presence of an aquatic host: a. Snail: schistosomiasis b. Cyclops: guineaworm, fish tape worm.