<prompt> A patient with the complaint of sore throat, dysphagia, and ulcers over the palate since 1 week, comes to OPD. On examination, you found vesicles over the soft palate and tonsillar pillar. The ulcers have a gray base and inflamed periphery. What could be the possible diagnosis?HerpanginaPharyngitisChickenpoxPrimary herpetic gingivostomatitis  <response>: Differential DiagnosisTonsillitis pharyngitis : No vesicles ulcers, purulent exudate, culture.Chickenpox : Skin lesionsPrimary herpetic gingivostomatitis : Generalised acute marginal gingivitis, not epidemic, in anterior part of oral cavity. 