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
Which of the following is the most common cause of late neurological deterioration in a case of cerebro- vascular accident - 
Select and explain. 
A. Rebleeding, B. Vasospasm, C. Embolism, D. Hydrocephalus
B: Vasospasm
Answer: B: Vasospasm 
Explanation: None