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: Dental
Portwine stain disappears after 
Select and explain. 
A. 1 Year, B. 2 Years, C. 5 Years, D. None of the above
D: None of the above
Answer: D: None of the above 
Explanation: Portwine stain is a vascular malformation that usually doesn't resolve and persists throughout life.
It is associated with Sturge - Weber syndrome.