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
Tumors arising from all the following structures produce papilloedema except 
Select and explain. 
A. Cerebrum, B. Cerebellum, C. Thalamus, D. Medulla
D: Medulla
Answer: D: Medulla 
Explanation: Tumor of  medulla rarely produce papilloedema.