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 –a) Juvenile glaucomab) Steroid induced glaucomac) Pigmentary glaucomad) Congenital glaucomae) Infantile glaucoma \nSelect and explain. \nA. ade, B. bde, C. abd, D. ad', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Primary glaucomas are :\n\ni) \xa0Congenital / developmental :- True congenital glaucoma, infantile glaucoma, juvenile glaucoma.\nii) \xa0Adult :- Primary open angle glaucoma, primary angle closure glaucoma, primary mixed mechanism glaucoma.\n\nPigmentary glaucoma and steroid induced glaucoma are secondary glaucomas.', 'role': 'assistant'}]