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
[{'content': '25 year old female presenting with lump in breast to OPD-First investigation is \nSelect and explain. \nA. USG, B. Mammogram, C. MRI, D. PET', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) USG(Ref Bailey and Love 27h edition Page 861)* USG is IOC in young females with Dense breast to evaluate a lump in Breast* It is not useful as a screening tool as it is operator dependent.', 'role': 'assistant'}]