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': 'Which one of the following is the standard prescribed for setback (open space around the house) in rural areas? \nSelect and explain. \nA. Built up area 1/3 and open space 2/3, B. Built up area 2/5 and open space 3/5, C. Built up area1/2 and space 1/2, D. Built up area 1/4 and open space 3/4', 'role': 'user'}, {'content': "Answer: A \nExplanation: Approved standards for rural housing at least 2 living rooms ample verandah space. the built-up area should not exceed 1/3 of total area. there should be a separate kitchen with a sink or platform for washing the house should be provided with sanitary latrine. window area should be at least 10% of floor area sanitary well within a quaer of a mile from house cattle shed 25 feet away from dwelling house adequate arrangements for waste disposal. Park's Textbook of Preventive and Social Medicine, 25th Edition, Pg 811", 'role': 'assistant'}]