This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Levels of Prevention of Disease, Subject name: Social & Preventive Medicine
Which of the following is not true regarding Pathogenesis of a disease? 
Select and explain. 
A. Screening is of no use in changing course of disease., B. Teiary prevention is possible., C. Entry of organism occurs., D. Includes subclinical cases.
A: Screening is of no use in changing course of disease.
Answer: A: Screening is of no use in changing course of disease. 
Explanation: - Pathogenesis phase of disease: Begins with entry of the disease 'agent' in the susceptible host. Multiplication of organism, disease initiation and progression is seen. Final outcome may be recovery, disability or death. Secondary and teiary levels of prevention are possible here. Screening of disease may improve prognosis and increase survival. (Hence, option-1 is wrong)