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
Action of adrenaline on which of the following receptor is not required in the treatment of analphylactic shock 
Select and explain. 
A. α1, B. α2, C. β1, D. β2
B: α2
Answer: B: α2 
Explanation: Action of adrenaline is necessary on:
α1 Receptors: To increase diastolic BP by vasoconstriction.
β1 receptors: To increase systolic BP by Cardiac stimulation.
β2 receptors: To cause bronchodilation & relieve bronchospasm.