This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood Vessels, Subject name: Pathology
Raynaud's phenomenon what change is seen in vessels initial stage: 
Select and explain. 
A. No change, B. Thrombosis, C. Fibrinoid necrosis, D. Hyaline sclerosis
A: No change
Answer: A: No change 
Explanation: Ans. (a) No change(Ref: Harrison 17th ed Table 243-1)Most common cause of Raynaud's Phenomenon -Primary or idiopathic.In initial stages of Raynaud's phenomenon no changes is seen late stages may show atherosclerosis or thrombosis