This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
[{'content': 'To study the incidence of malaria, according to various age and sex groups, in a village, we need to undeake \nSelect and explain. \nA. Descriptive, B. Case-control study, C. Coho study, D. Experimental study', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Descriptive studies are concerned with observing the distribution of disease or health-related characteristics - When is the disease occurring, where is it occurring, who is getting the disease.Park 23e pg: 63', 'role': 'assistant'}]