This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
[{'content': 'Which of the following is the BEST diagnostic method for detecting breast lump? \nSelect and explain. \nA. USG, B. Mammogram, C. Biopsy, D. FNAC', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Remember: First investigation in case of breast lump is FNAC Best and the definitive investigation in case of breast lump is Open Biopsy Preferred method of investigation in breast lump is Core Needle Biopsy Ref: Schwaz 9/e Page 425; CSDT 12/e, Page 306.', 'role': 'assistant'}]