This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
With regard to hypeension, which is not a mode of primary prevention? 
Select and explain. 
A. Weight reduction, B. Exercise, C. Reduced salt intake, D. Early diagnosis of hypeension
D: Early diagnosis of hypeension
Answer: D: Early diagnosis of hypeension 
Explanation: It is a secondary mode of prevention. Primary prevention:To avoid occurrence of disease. Secondary prevention:To diagnose and treat existent disease in early stages before it causes significant morbidity Teiary prevention:To reduce negative impact of extant disease by restoring function and reducing disease-related complications. Quaternary prevention:To avoid results of unnecessary or excessive interventions in the health system