This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Tumors, Subject name: Ophthalmology
Most common site of bony metastases in Retinoblastoma- 
Select and explain. 
A. Skull bones, B. Hip bones, C. Ribs, D. Veebrae
A: Skull bones
Answer: A: Skull bones 
Explanation: *Metastasis by blood stream occurs to skill bone and distal bones. Ref: AAO- Ophthalmic pathology and Intraocular Tumors, section 4, 2014-15 p.304.