This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Screening, Subject name: Social & Preventive Medicine
Which of the following can be prevented by screening- 
Select and explain. 
A. Ca cervix, B. Ca breast, C. Ca prostate, D. Ca lung
A: Ca cervix
Answer: A: Ca cervix 
Explanation: Ref:Parks 23rd edition pg 387. The prolonged early phase of cancer in situ can be detected by the Pap smear. The present strategy is to screen women using visual inspection after application of freshly prepared 5% acetic acid solution.