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: Anatomy
The retina is an out growth of the ? 
Select and explain. 
A. Mesencephalon, B. Diencephalon, C. Telencephalon, D. Pons
B: Diencephalon
Answer: B: Diencephalon 
Explanation: Ans. is 'b' i.e., Diencephalon Diancephalon forms - optic cup and stalk, pituitary, thalmus, hypothalmus, epithalmus, pineal gland (or epiphysis), and 3rd ventricle (most pa). Retina develops from walls of optic cup. The outer thinner layer becomes retinal pigmented epithelium and inner thicker layer forms neural layer of retina.