This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2019, Subject name: Radiology
[{'content': 'In the shown lateral view, the GIT structure marked with arrow head is? \nSelect and explain. \nA. Esophagus, B. Pulmonary aery, C. Trachea, D. Left atrium', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Normal Lateral Chest Xrays: Normal Findings: - Sternum - Retrosternal space and retrocardiac space should be : clear spaces or lucent areas - Obliteration of Retrosternal space: Right Ventricular Hyperophy - Tracheal Lucency - Lucency of veebra should increase- more black- as we go from top to bottom . - Right dome of can be traced all the way anterior . - Left dome of diaphragm gets obscured by cardiac shadow . - Major fissure seen only in Right Lung - Minor fissure seen both in Right and left lung.', 'role': 'assistant'}]