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
[{'content': 'Most effective natural barrier to rabies - \nSelect and explain. \nA. Heat, B. Humidity, C. Water, D. None', 'role': 'user'}, {'content': 'Answer: C \nExplanation: <p> RABIES:- Rabies, an acute highly fatal viral disease of CNS caused by Lyssavirus type 1( neurotropic RNA virus). Mode of transmission- Deep bite/ scratch by an infected animal. Dogs are the main host and transmitter if rabies. Transmission can also occur when infectious material usually saliva comes into direct contact with human mucosa/fresh skin wounds. Humam to human transmission even though possible yet not confirmed. Rabies can be contracted by inhalation of virus containing aerosols / transplantation of an infected organ. Ingesting raw meat/ other tissues from animals infected with rabies is not a source of infection. Water appears to be the most effective natural barrier to rabies. {Reference: park&;s textbook of preventive and social medicine, 23rd edition, pg no.277}</p>', 'role': 'assistant'}]