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
[{'content': 'Sinus arrhythmia occurs:- \nSelect and explain. \nA. Due to sympathetic overstimulation, B. Due to change in respiration, C. Due to change in body temperature, D. None', 'role': 'user'}, {'content': "Answer: B \nExplanation: During inspiration & Expiration Patient's hea rate tends to change, so respiration can trigger sinus arrythmia During inspiration=JVP fall, BP fall, HR|", 'role': 'assistant'}]