This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Tumors, Subject name: Ophthalmology
[{'content': 'Increased LDH in Aqueous Humor suggest a diagnosis of- \nSelect and explain. \nA. Galactosemia, B. Retinoblastoma, C. Glaucoma, D. Gyrate atrophy', 'role': 'user'}, {'content': 'Answer: B \nExplanation: *LDH of aqueous humor is often used as a marker for retinoblastoma. Ref: Khurana 7th/e p.314.', 'role': 'assistant'}]