This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable Diseases, Subject name: Social & Preventive Medicine
Which of the follow ing is a zoonotic disease - 
Select and explain. 
A. Hydatid cyst, B. Malaria, C. Filariasis, D. Dengue fever
A: Hydatid cyst
Answer: A: Hydatid cyst 
Explanation: Ans. is 'a' i.e., Hydatid cyst important zoonoses1. Bacterial - Anthrax, Brucellosis, Omithoses, Q-fever, Leptospirosis, TB, Plague, Tularemia, Salmonellosis.2 Viral - Cowpox, Monkeypox, Eastemequine, encephalitis, Ross river fever, Yellowr fever, Japanese encephalitis, Lassa fever. Rabies.Protozoal - Leishmaniasis, Toxoplasmosis, Trypanosomiasis, Babesiosis.Helminthic - Clonorchiasis, Fasciolopsis, Schistosomiasis, Echinococus (hydatid disease), Taeniasis, Trichinellosis.