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': 'What is the size of ideal mosquito net ? - \nSelect and explain. \nA. 0.575 mm in one dimension, B. 0.0475 mm in any dimension, C. 0.475 mm in one dimension and 0.575 in other dimension, D. 0.575 in both dimensions', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]