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
If a patient with Raynaud’s disease immersed his hand in cold water, the hand will 
Select and explain. 
A. Become red, B. Remain unchanged, C. Turn white, D. Become blue
C: Turn white
Answer: C: Turn white 
Explanation: None