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: Medicine
All are manifestations of tuberous sclerosis, EXCEPT: 
Select and explain. 
A. Retinal hamaomas, B. Pulmonary lymphangioleiomyomatosis, C. Posterior embryotoxon, D. Renal angiomyolipomas
C: Posterior embryotoxon
Answer: C: Posterior embryotoxon 
Explanation: Internal manifestations of tuberous sclerosis include seizures, mental retardation, central nervous system (CNS) and retinal hamaomas, pulmonary lymphangioleiomyomatosis (women), renal angiomyolipomas, and cardiac rhabdomyomas. Ref:Harrisons Principles of Internal Medicine, 18th Edition, Page 410