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: Surgery
Which of the following is untrue regarding "sick sinus syndrome": 
Select and explain. 
A. Occurs most commonly in elderly, B. Coronary disease is a common cause, C. ECG manifestations are often intermittent, D. Most symptomatic patients will require permanent pacing.
B: Coronary disease is a common cause
Answer: B: Coronary disease is a common cause 
Explanation: Coronary disease is a common cause Sick sinus syndrome is usually caused by idiopathic fibrosis of the sinus node. - Coronary disease is an uncommon cause. - Pharmacologic therapy for sick sinus syndrome has been difficult but recent studies have indicated that oral theophylline may be effective especially when sinus bradycardia is the major manifestation.