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
Venous ulcer has following characteristics except 
Select and explain. 
A. Irregular wound margins, B. Deep pale wound bed, C. Usually no pain, D. Ruddy, granular tissue
B: Deep pale wound bed
Answer: B: Deep pale wound bed 
Explanation: Venous ulcer is superficial wound.