This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2017, Subject name: Anatomy
[{'content': 'NOT a content of superior mediastinum \nSelect and explain. \nA. Pulmonary trunk, B. Thymus, C. Left superior intercostal aery, D. Arch of aoa', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Mediastinum refers to the space between two lungs in thorax. SUPERIOR MEDIASTINUM Space above 2nd costal cailage CONTENTS: thymus, arch of aoa, superior venacava, pulmonary aeries, esophagus, trachea, T1 - T4 veebra, PICA - 1, 2. INFERIOR MEDIASTINUM Space below superior mediastinum, again divided into anterior, middle and posterior mediastinum. CONTENTS: pulmonary trunk, bronchus, thymus, hea, ascending aoa, PICA 3 - 12 esophagus, descending aoa, T5 - T12 veebra. Angle between manubrium of sternum & body of sternum is called angle of louis, which is 1630.', 'role': 'assistant'}]