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
Best definitive investigation for carcinoma breast is? 
Select and explain. 
A. Biopsy, B. FNAC, C. USG, D. Mammography
A: Biopsy
Answer: A: Biopsy 
Explanation: Ans. (a) BiopsyRef: Bailey & Love 25th ed. / 289, 290