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
Toxic focal myopathy is adverse affect of- 
Select and explain. 
A. Aminoglycosides, B. Narcotics, C. Insulin, D. Penicillin
B: Narcotics
Answer: B: Narcotics 
Explanation: None