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 of the following drugs is used to control tachycardia and palpitations in persons with acute symptoms of hypehyroidism ? 
Select and explain. 
A. Liothyronine, B. Propanolol, C. Methimazole, D. Potassium iodide
B: Propanolol
Answer: B: Propanolol 
Explanation: Ans. is 'b' i.e., Propanolol