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
Which of the following is primary glaucoma: 
Select and explain. 
A. Juvenile glaucoma, B. Steriod induced glaucoma, C. Pigmentary glaucoma, D. All
A: Juvenile glaucoma
Answer: A: Juvenile glaucoma 
Explanation: Ans. Juvenile glaucoma