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
The installation and usage of sanitary latrines by general public constitutes which level of prevention 
Select and explain. 
A. Health promotion, B. Specific protection, C. Early diagnosis and treatment, D. Disability limitation and rehabilitation
A: Health promotion
Answer: A: Health promotion 
Explanation: Provision of safe water, installation of sanitary latrine, control of insects and rodents, improvement of housing comes under environmental modification of health promotion. Ref: Park&;s textbook of preventive and social medicine; 23rd edition