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: Pathology
Raynaud's phenomenon what change is seen in vessels initial stage - 
Select and explain. 
A. No change (Fibrinoid, Thrombosis), B. Thrombosis, C. Fibrinoid necrosis, D. Hyaline sclerosis
A: No change (Fibrinoid, Thrombosis)
Answer: A: No change (Fibrinoid, Thrombosis) 
Explanation: Structural changes in the arterial walls are absent except late in the course, when intimal thickening can appear.