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
Riga fede disease is the ulceration seen on 
Select and explain. 
A. Attached gingiva, B. Buccal mucosa, C. Lower Lip, D. Tongue
D: Tongue
Answer: D: Tongue 
Explanation: None