This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gall Bladder & Bile Ducts, Subject name: Surgery
[{'content': 'Initial investigation done for Suspected Gallbladder stones \nSelect and explain. \nA. USG, B. FRCP, C. MRCP, D. CT scan', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) USGRef: Bailey and Love 27th edition Page 1191* For Biliary Pathology Initial Imaging Modality of Choice is USG as it is easily available and inexpensive and Quick to perform, However it is operator dependent.', 'role': 'assistant'}]