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
Which of the following is not a type of teukoplakia: 
Select and explain. 
A. Ulcerative, B. Bullous, C. Speckled, D. Homogenous
B: Bullous
Answer: B: Bullous 
Explanation: None