This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Breast, Subject name: Surgery
Mammography is used for screening from 
Select and explain. 
A. 20 years, B. 30 years, C. 40 years, D. 50 years
C: 40 years
Answer: C: 40 years 
Explanation: Ans. (c) 40 years(Ref Schwartz page 513/ 10th edition)* American Cancer Society (ACS) recommends screening from 40 years* Other many recommend - from 50 years. (But Sabiston 20th edition also recommends 40 years - so let us go with 40 years)