This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: DNB 2018, Subject name: Medicine
Sinus arrhythmia occurs:- 
Select and explain. 
A. Due to sympathetic overstimulation, B. Due to change in respiration, C. Due to change in body temperature, D. None
B: Due to change in respiration
Answer: B: Due to change in respiration 
Explanation: During inspiration & Expiration Patient's hea rate tends to change, so respiration can trigger sinus arrythmia During inspiration=JVP fall, BP fall, HR|