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
Recurrent ulcers occurring on gingiva and palate are
most probably: 
Select and explain. 
A. Aphthous ulcers, B. Herpes simplex, C. Koplick spots, D. Lesions of Behcet's syndrome
B: Herpes simplex
Answer: B: Herpes simplex 
Explanation: None