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: Medicine
During valsalva maneuver, impaired heart rate changes seen in - 
Select and explain. 
A. Homer's syndrome, B. Autonomic insufficiency, C. Vestibular dysfunction, D. Cephalic ischemia
B: Autonomic insufficiency
Answer: B: Autonomic insufficiency 
Explanation: None