This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Magnetic Resonance Imaging, Subject name: Radiology
On MR-spectroscope, at 3.2ppm which peak is seen? 
Select and explain. 
A. Lipid lactate, B. N-acetyl aspaate, C. Creatinine, D. Choline
D: Choline
Answer: D: Choline 
Explanation: MR Spectroscopy compares the chemical composition of normal brain tissue with abnormal tumor tissue. Lipid lactate peak is seen at 1.33 ppm NAA peak is seen at 2 ppm Creatine at 3 ppm Choline at 3.2 ppm Figure: Choline peak at 3.2 ppm - primary CNS lymphoma