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
Elevation of which of the following metabolite in MR Spectroscopy suggests a possibility of carcinoma prostate? 
Select and explain. 
A. Citrate, B. Acetate, C. Choline, D. NAA
C: Choline
Answer: C: Choline 
Explanation: 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