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 following 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: - zoonoses have been defined as those disease and infection which are naturally transmitted between veebrate animals and man. - hydatid disease is a zoonotic disease of man . It is caused in man by the metacystode stage of the canine intestinal tapeworm, Echinococcus. The adult worms are found in dogs and other carnivores. Reference : Park's textbook of preventive and social medicine, 23rd edition, pg no:276, 303 <\p>