<prompt> The retina is an out growth of the :MesencephalonDiencephalonTelencephalonPons  <response>: B i.e. Diencephalon - Forebrain prosencephalon consists of telencephalon anterior or rostral pa and diencephalon posterior or caudal pa. - Telencephalon forms cerebral hemisphere and their cavities -- lateral ventricle and pa of 3rd ventricle- Diancephalon forms - optic cup stalkQ, pituitary, thalmus, hypothlmus, epithalmus, pineal gland or epiphysis, 3rd ventricle most pa- Retina develops from walls of optic cupQ. The outer thinner layer becomes retinal pigmented epithelium and inner thicker layer forms neural layer of retina. 