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
A patient Shyam is admitted to the emergency following a drug overdosage with severe tachycardia. He had been receiving therapy for hypertension and angina. Which of the following drugs can cause tachycardia ? 
Select and explain. 
A. Guanethidine, B. Isosorbide dinitrate, C. Propranolol, D. Verapamil
B: Isosorbide dinitrate
Answer: B: Isosorbide dinitrate 
Explanation: None