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': 'Which of the following is primary glaucoma: \nSelect and explain. \nA. Juvenile glaucoma, B. Steriod induced glaucoma, C. Pigmentary glaucoma, D. All', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Juvenile glaucoma', 'role': 'assistant'}]