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
Papillae involved in intraoral acanthosis nigricans is 
Select and explain. 
A. Filliform papillae, B. Circumvallate papillae, C. Fungiform papillae, D. All of the above
A: Filliform papillae
Answer: A: Filliform papillae 
Explanation: None