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
A 70 year old man was administered, penicillin i.v. Within 5 minutes, he developed generalized urticaria, swelling of lips, hypotension and bronchospasm. The first choice is to administer : 
Select and explain. 
A. Chlorpheniramine inj, B. Epinephrine inj, C. High dose hydrocortisone tablet, D. Nebulized salbutamol
B: Epinephrine inj
Answer: B: Epinephrine inj 
Explanation: None