This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S., Subject name: Medicine
All are true about patients with neurofibromatosis except that they are prone for: 
Select and explain. 
A. Gliomas, B. Retinoblastoma, C. Schwannoma, D. Meningioma
B: Retinoblastoma
Answer: B: Retinoblastoma 
Explanation: Ans: bRef: Harrison, 16thed, p. 2457