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: Surgery
Sequence of changes seen in Raynaud's disease is: March 2012 
Select and explain. 
A. Red, blue, white, B. White, blue, red, C. Red, blue, white, D. White, red, blue
B: White, blue, red
Answer: B: White, blue, red 
Explanation: Ans: B i.e. White, blue, red Raynaud's disease is recognized by the characteristic sequence of blanching (constriction of vessels), dusky cyanosis (dilation of capillaries & filling with slowly flowing deoxygenated blood) & red engorgement (relaxation of aerioles & return of oxygenated blood into the dilated capillaries)