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
Patch on tonsil is not caused by:
assistant
The correct answer is  (d) Ludwig's angina(Ref. Scott Brown, 8th ed., Vol 3; 550)Ludwig's angina does not involve tonsil. The other options can lead to patch/pseudomembrane on the tonsil.