This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Parasitology Pa 2 (Helminthology), Subject name: Microbiology
[{'content': 'Chandlers Index is used in epidemiological studies of \nSelect and explain. \nA. Round worms, B. Hookworms, C. Guinea worms, D. Sand fly', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Chandler Index:-used for hookwormIt is the average number of hookworm eggs per gram of faeces forthe entire community.Below 200 -Hookworm is not much significance200 - 250 -May be regarded as potential danger250 - 300 -Minor public health problemAbove 300 -Impoant public health problem', 'role': 'assistant'}]