This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Genito Urinary System, Subject name: Radiology
[{'content': 'Elevation of which of the following metabolite in MR Spectroscopy suggests a possibility of carcinoma prostate? \nSelect and explain. \nA. Citrate, B. Acetate, C. Choline, D. NAA', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans CMR Spectroscopy of Prostate - Principal among the identifiable metabolite is citrate, found in relatively high concentration in the glandular tissue of a healthy prostate. The normal MRI spectrum of the prostate reveals a prominent citrate peak, which often appears as a doublet if the shim is good enough. Other are those of creatinine and choline. Choline is a composite peak made up of phospholipid membrane components. It is elevated in many malignant tumors, including prostate cancer', 'role': 'assistant'}]