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: Social & Preventive Medicine
[{'content': 'The definitive host for echinococcus granulosus is: September 2012 \nSelect and explain. \nA. Man, B. Sheep, C. Hound, D. Dog', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans: D i.e. Dog Canids (dogs, dingoes, wolves, and coyotes) act as definitive hosts for adult worms, while omnivorous/herbivorous mammals (humans, domestic animals and wildlife) serve as intermediate hosts for encysted larval stages.', 'role': 'assistant'}]