This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
A 38-year-old daily laborer has a hea rate of 44 on routine examination. What is the treatment? 
Select and explain. 
A. Atropine, B. Cardiac pacing, C. Adrenaline, D. No treatment required
D: No treatment required
Answer: D: No treatment required 
Explanation: Resting hea rates <60 beats/ min are very common in young healthy individuals and physically conditioned subjects. By definition, sinus bradycardia is a rhythm driven by the SA node with a rate of <60 beats/min; sinus bradycardia is very common and typically benign. A sinus rate of <40 beats/min in the awake state in the absence of physical conditioning generally is considered abnormal.Harrison 19e pg: 1468