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
Drug of choice in theophylline poisoning: 
Select and explain. 
A. Coisone, B. Propranolol, C. Thyroxine, D. Phenobarbitone
B: Propranolol
Answer: B: Propranolol 
Explanation: Propranolol