This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Concept of health and disease, Subject name: Social & Preventive Medicine
[{'content': 'The installation and usage of sanitary latrines by the general public constitutes which level of prevention? \nSelect and explain. \nA. Primary, B. Primordial, C. Teiary, D. Secondary', 'role': 'user'}, {'content': "Answer: A \nExplanation: Primary prevention is concerned with preventing the onset of disease; it aims to reduce the incidence of disease. It involves interventions that are applied before there is any evidence of disease or injury. Examples include protection against the effects of a disease agent, as with vaccination, garbage collection, refrigeration of food, etc. Ref: 25th edition, Park's Textbook of Preventive and Social Medicine, Page no. 48", 'role': 'assistant'}]