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 the treatment of all of the following EXCEPT: 
Select and explain. 
A. Angina, B. Partial atrioventricular block, C. Idiopathic hypertrophic subaortic cardiomyopathy, D. Familial tremor
B: Partial atrioventricular block
Answer: B: Partial atrioventricular block 
Explanation: None