This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Entomology, Subject name: Social & Preventive Medicine
[{'content': 'Number of holes per square inch of a standard mosquito net is? \nSelect and explain. \nA. 100, B. 150, C. 250, D. 175', 'role': 'user'}, {'content': 'Answer: B \nExplanation: ANSWER: (B) 150REF: Park 20th edition page 678"The size of the opening of mosquito net is of utmost importance- the size should not exceed 0.0475 inch in any diameter. The number of holes in one square inch is usually 150"', 'role': 'assistant'}]