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
A coin foreign body is stuck in esophagus at 25cm from incisors. This is approximately situated at which of the following levels?
assistant
The correct answer is  On endoscopy, 3 narrowing's are seen from upper incisors. Mnemonic B - 15 AL - 25 D - 40 B - At beginning/cricopharynx 15 cm from upper incisors A- At Arch of aoa 25cm from upper incisors L- At Left Bronchus 25 cm from upper incisors D- At Diaphragm 40cm from upper incisiors