This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
[{'content': 'Which of the following is the pathogen responsible for blindness in advanced HIV infections? (NOT RELATED) \nSelect and explain. \nA. Cytomegalovirus, B. Epstein-Barr virus, C. Fungus, D. Toxoplasma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: .', 'role': 'assistant'}]