system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Punched-out, crater-like depressions at the crest of the gingiva, covered by gray pseudo- membranous slough, which is demarcated from the remainder of the gingiva by linear erythema, are characteristic of
assistant
The correct answer is  None