This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
[{'content': 'Commonest infection causing blindnesss in adult man : \nSelect and explain. \nA. Toxocara, B. Plasmodium, C. Toxoplasma gondii, D. Tenia solium', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Toxoplasma gondii', 'role': 'assistant'}]