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': 'Which is the ideal (most scientific) setting for an epidemiological study \nSelect and explain. \nA. Case-Control study, B. Coho study, C. Experimental study, D. Cross-section study', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Experimental or intervention studies are similar in approach to coho studies excepting that conditions in which study is carried out are under the direct control of the investigator.The aim of experimental studies may be stated as followsa) to provide &;scientific proof&; of aetiological factors or risk factorsb) to provide a method of measuring the effectiveness and efficiency of health servicesPark 23e pg:80', 'role': 'assistant'}]