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
Secondary prevention is applicable to ? 
Select and explain. 
A. Causal factors, B. Early stage of disease, C. Late stage of disease, D. None of the above
B: Early stage of disease
Answer: B: Early stage of disease 
Explanation: Ans. is 'b' i.e.,Early stage of disease Primordial prevention - Before risk factor present.Primary prevention - Before onset of disease (risk factor present).Secondary prevention - In early stage of disease.Teiary prevention - Late stage of disease.