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
Glaucoma associated with intraocular tumours is due to 
Select and explain. 
A. Trabecular block by tumour cells, B. Neovascularization of the angle, C. Venous stasis following obstruction to vortex veins, D. All the above
D: All the above
Answer: D: All the above 
Explanation: None