This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Breast Cancer - Types and Staging, Subject name: Surgery
Which ca breast is B/L 
Select and explain. 
A. Lobular, B. Paget's ds., C. Medullary, D. None
A: Lobular
Answer: A: Lobular 
Explanation: Ans. is 'a' ie. Lobular "LCIS (lobular Ca in situ) occurs bilaterally in 50 to 70% of cases, while DCIS occurs bilaterally in 10 to 20% of cases" - Schwartz"Invasive lobular Ca is frequently multifocal, multicentric and bilateral" - Schwartz