This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Incomplete closure of ectodermal cleft is know to cause \nSelect and explain. \nA. Retinal detachment, B. Iridodonesis, C. Retinoblastoma, D. Coloboma of iris and retina', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Inderbir Singh&;s Human embryology Tenth edition Pg 364 Failure of the choroidal fissure to obliterate completely may lead to deficiencies( coloboma)of various layers of eyeball including iris ciliary body and choroid', 'role': 'assistant'}]