This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuroradiology, Subject name: Radiology
[{'content': 'Ring Enhancing lesion In AIDS patient is Most Likely due to? \nSelect and explain. \nA. Cryptococcosis, B. Hydatid Cyst, C. Neurocysticercosis, D. Toxoplasmosis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: *Toxoplasmosis and CNS lymphoma are the major differentials for a Ring Enhancing lesion in AIDS Patients Toxoplasmosis produces Eccentric target sign within a ring Enhancing lesion', 'role': 'assistant'}]