This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable Diseases, Subject name: Social & Preventive Medicine
[{'content': "Which index is used in relation to Hookworm infestation - \nSelect and explain. \nA. Quetelet's index, B. Chandler's index, C. Soiling index, D. Broca's index", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Chandler's index o Has been explained in previous sessions", 'role': 'assistant'}]