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
Apex at of the lung lies at what level?
assistant
The correct answer is  Ans. is 'a' i.e., Above the clavicle * Apex lies in the inlet of thorax, 2.5 cm above the clavicle. It is related anteriorly to subclavian artery and vein. Posteriorly it is separated from neck of first rib by (from medial to lateral) sympathetic trunk, fist posterior intercostal vein, superior intercostal artery, and ascending branch of ventral ramus of 1st thoracic nerve.