This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Clinical Presentation and Physiology, Subject name: Surgery
Commonest site of Ca breast is: 
Select and explain. 
A. Upper outer quadrant, B. Upper inner quadrant, C. Lower outer quadrant, D. Lower inner quadrant
A: Upper outer quadrant
Answer: A: Upper outer quadrant 
Explanation: Ans: a (Upper outer quadrant) Ref: Bailey & Love, 24th ed, p. 837Note:Breast carcinoma with good prognosis evenwith axillary lymph nodes-Medullary CaBull's eye appearance is seen in- Invasive lobularDesmoplastic reaction is shown by- Ductal invasiveComedo carcinoma is- Ductal carcinoma in situ (DCIS)Most common variant of breast carcinoma- Ductal invasiveLobular carcinoma - Multicentnc and bilateralThe underlying lobular architecture can still be recognized on microscopic examination "Indian file pattern" is seen.