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
Apthous like ulcers are seen in: 
Select and explain. 
A. Bechets syndrome, B. Sweet syndrome, C. PFAPA (periodic fever acute pharyngitis apthous stomatitis), D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: None