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: Pharmacology
Which antihypertensive is a prodrug and is converted to its active form in the brain? 
Select and explain. 
A. Clonidine, B. Methyldopa, C. Minoxidil, D. Nitroprusside
B: Methyldopa
Answer: B: Methyldopa 
Explanation: None