This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vitreous and retina, Subject name: Ophthalmology
[{'content': 'Headlight in fog appearance is seen in which retinal choroiditis \nSelect and explain. \nA. Toxoplasma, B. CMV retinitis, C. Candida retinitis, D. Toxocara', 'role': 'user'}, {'content': "Answer: A \nExplanation: Toxoplasma retinochoroidal lesions appear as a headlight in fog appearance due to active retinitis Presence of active retinal lesions with severe vitreous inflammatory reaction can cause the classic 'headlight in the fog' appearance. In these cases the hallmarks of retinal disease include bilateral disease, old retinal scars, and involvement of the macula. Reference: Aravind FAQS in Ophthalmology; First Edition; Page no: 148", 'role': 'assistant'}]