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: Pharmacology
Propranolol is useful in all EXCEPT: 
Select and explain. 
A. Atrial flutter, B. Parkinsonian tremor, C. Thyrotoxicosis, D. Hypertrophic cardiomyopathy
B: Parkinsonian tremor
Answer: B: Parkinsonian tremor 
Explanation: None