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': 'Chorioretinitis is commonly caused by all of the Following except: March 2009 \nSelect and explain. \nA. Cryptococcosis, B. Onchocerciasis, C. Cytomegalovirus infection, D. Toxoplasmosis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B: Onchocerciasis Chorioretinitis (CR) is an inflammatory process that involves the uveal tract of the eye. Inflammation is usually caused by congenital viral, bacterial, or protozoal infections in neonates. Congenital toxoplasma and cytomegalovirus infection are the most common etiologies in this age group. Fungal infections are commonly identified', 'role': 'assistant'}]