This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: CT SCAN, Subject name: Radiology
[{'content': 'Investigation not useful in Multiple Myeloma \nSelect and explain. \nA. CT SCAN, B. MRI, C. BONE SCAN, D. PET', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The Bone scan is a nuclear scan done using Tc99m-MDP and shows a hot spot in areas of osteoblastic activity. As Multiple myeloma has osteolytic metastasis, So bone scan is not sensitive for detecting these bone mets and usually appear as cold areas Multidetector CT (MDCT) is more sensitive in detecting Myeloma and a low-dose technique can be used to limit radiation to the patient', 'role': 'assistant'}]