This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
[{'content': 'Carina is situated at which level ? \nSelect and explain. \nA. T3, B. T4, C. T6, D. T9', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is '13' i.e., T4Trachea bifurcates at carina, at the level of lower border of 7'4 or T4- Ts disc space.Structure Cervico thoracic levelTracheal bifurcation T4-T5Arch of aoa Begins and ends at T4Xiphoid process T9Splenic axis Along 10th ribCarotid bifurcation, Hyoid bone C3Upper border of thyroid cailage C4 Level of cricoids cailageLumbar levelCeliac trunk T12 - L ISuperior mesenteric aery LlTranspyloric plane Lower border of Ll", 'role': 'assistant'}]