This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Environment and health, Subject name: Social & Preventive Medicine
[{'content': 'Diethyltoluamide is an effective - \nSelect and explain. \nA. Larvicidal, B. Agent againts pupae of anophales, C. Repellent, D. Space spray', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Diethyl toluimide /deetis an all purpose repellant.They are used for application on skin, and their chief advantage is sho duration of protection.Repellant are contact poisons. They are used as peraonal protective measure against mosquito bite.Other neasure are using mosquito nets and screening. Parks textbook of preventive and social medicine.K Park. Edition 23.Pg no: 773,783', 'role': 'assistant'}]