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
Which of the following combinations will show vasomotor reversal of Dale 
Select and explain. 
A. Phentolamine followed by adrenaline, B. Propanalol followed by adrenaline, C. Phentolamine followed by nor adrenaline, D. Propanalol followed by nor adrenaline
A: Phentolamine followed by adrenaline
Answer: A: Phentolamine followed by adrenaline 
Explanation: Adrenaline leads to increased BP by acting on α1 - receptors, and  vasodilation by action on β2 receptors. If it is administered after Phentolamine (α1 - blocker) it can lead to only vasodilation, which is termed as "Vasomotor reversal of Dale".