This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy and physiology of bone and fracture healing, Subject name: Orthopaedics
[{'content': 'Headlight in fog appearance in retina \nSelect and explain. \nA. Toxoplasmosis, B. ARN, C. CMV retinitis, D. Candida retinitis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: White focal retinitis with overlying vitreous inflammation ("headlight in the fog") is seen in Toxoplasmosis', 'role': 'assistant'}]