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
[{'content': 'False about Diffusion-weighted MRI : \nSelect and explain. \nA. High apparent Diffusion Coefficient, B. Based on brownian motion, C. Detects cytotoxic edema before a vasogenic edema develops, D. High cellularity tumours can be detected', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Diffusion-weighted imaging (DWI) Based on Brownian motion of water molecules within a voxel of tissue. When there is Diffusion Restriction-MRI gives a bright signal on DWI images and has low apparent Diffusion Coefficient(ADC value). DW-MRI detects Cytotoxic edema before a Vasogenic edema develops. Lesions showing Diffusion Restriction Infarct(Acute Infarct)- IOC Abscess Medulloblastoma & Other High Cellularity Tumours . Epidermoid Cyst', 'role': 'assistant'}]