This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hypeension, Arrhythmias, Dyslipidemia, Subject name: Pharmacology
The only drug whose over dosage is not characterized by both hypotension and bradycardia is: 
Select and explain. 
A. Propanolol, B. Verapamil, C. Clonidine, D. Theophylline
D: Theophylline
Answer: D: Theophylline 
Explanation: Theophylline results in reflex tachycardia due to its vasodilatory action. Propanolol, verapamil and clonidine cause hypotension as well as bradycardia.