This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: D.O.C, Subject name: Pharmacology
DOC for anaphylaxis is - 
Select and explain. 
A. Morphine, B. Adrenaline, C. Hydrocortisone, D. Chlorpheniramine
B: Adrenaline
Answer: B: Adrenaline 
Explanation: Ans. is 'b' i.e., Adrenaline Treatment of anaphylactic shock* First adrenaline should be given im to raise the blood pressure and to dilate the bronchi.* If the treatment is delayed and shock has developed, adrenaline should be given i.v. by slow injection.* The adrenaline should be accompanied by H1 antihistaminic (Chlorphenamine) and hydrocortisone - Antihistaminic slowly antagonizes the effect of histamine on H receptors, and steroids reduce vascular permeability & suppresses further response to the antigen-antibody reaction.