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
The following drugs are useful in hypertension except 
Select and explain. 
A. Calcium channel blockers, B. Alpha methyl dopa, C. Beta Mockers, D. Pentoxifyline
D: Pentoxifyline
Answer: D: Pentoxifyline 
Explanation: None