question: Q:A 60-year-old Caucasian man comes to the physician because of progressive fatigue, shortness of breath, and leg swelling for the past 4 months. He has to pause several times when climbing one flight of stairs. For the past 10 years, he has had joint pain in his hands, wrists, and knees. He has diabetes mellitus and hypertension controlled with daily insulin injections and a strict low-calorie, low-sodium diet. He takes ibuprofen as needed for his joint pain. His wife says that he snores at night. He drinks two to three beers daily. He has smoked half a pack of cigarettes daily for the past 40 years. He went camping in northern New York one week ago. His vital signs are within normal limits. Physical examination shows jugular venous distention, pitting edema around the ankles, and tanned skin. Crackles are heard at both lung bases. An S3 is heard at the apex. The liver is palpated 2 to 3 cm below the right costal margin. His skin appears dark brown. An ECG shows a left bundle branch block. Echocardiography shows left atrial and ventricular enlargement, reduced left ventricular ejection fraction, and mild mitral regurgitation. Which of the following is most likely to have prevented this patient's condition?? 
  {'A': 'Smoking cessation', 'B': 'Nocturnal continuous positive airway pressure therapy', 'C': 'Surgical valve repair', 'D': 'Regular phlebotomy', 'E': 'Protective clothing'},