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
All are true about arterial thrombosis except? 
Select and explain. 
A. Retrograde growth, B. Line of Zahn, C. Complete lumen obstruction, D. White thrombus
C: Complete lumen obstruction
Answer: C: Complete lumen obstruction 
Explanation: None