<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 72-year-old man with congestive heart failure is brought to the emergency department because of chest pain, shortness of breath, dizziness, and palpitations for 30 minutes. An ECG shows a wide complex tachycardia with a P-wave rate of 105min, an R-wave rate of 130min, and no apparent relation between the two. Intravenous pharmacotherapy is initiated with a drug that prolongs the QRS and QT intervals. The patient was most likely treated with which of the following drugs?? A: Verapamil, B: Carvedilol, C: Flecainide, D: Sotalol, E: Quinidinen,  <response>: This is a clinical case of a 72-year-old man with congestive heart failure presenting with symptoms of chest pain, shortness of breath, dizziness and palpitations, along with ECG findings of a wide complex tachycardia. The stem provides clues that the patient was treated with an antiarrhythmic drug that prolongs the QRS and QT intervals. Based on the patients age, medical history, and ECG findings, this appears to be a case of atrial fibrillation with rapid ventricular response. The antiarrhythmic drug given would be expected to slow the ventricular rate in AF by prolonging conduction through the AV node. Of the choices provided, flecainide, sotalol and quinidine can prolong QRS and QT intervals. Verapamil is a calcium channel blocker that would not prolong QRS or QT. Carvedilol is a beta blocker that may prolong the PR interval but not QRS or QT.Of the options that can prolong QRS and QT, flecainide and sotalol would actually be contraindicated in a patient with structural heart disease like congestive heart failure. Quinidine would be the most appropriate treatment choice in this clinical scenario.E: Quinidine 