A 70-year-old man was administered penicilline intravenously.Within 5 minutes,he developed generalised urticaria,swelling of lips,hypotension and bronchospasm.The first choice of treatment is to administer:

• A. chlorphenitramine inj
• B. epinephrine inj
• C. High dose hydrocortisone tablet
• D. nebulised salbutamol