This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Trauma, Subject name: Surgery
[{'content': 'A young male met with a road traffic accident and came to the emergency department, he was evaluated found to have BP-130/80 mm HG, pulse rate - 88/min, RR -22/min. On auscultation there was decreased air entry on one side with absent breath sounds. X-ray chest is given below. Your most probable diagnosis is \nSelect and explain. \nA. Tension pneumothorax, B. Rupture of esophagus and compressing the pericardium, C. Flail chest due to fracture of ribs 5,6,7,8 ribs, D. Normal CXR', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. (b) Rupture of esophagus and compressing the pericardium* This image shows Pneumo mediastinum which is a feature of Esophageal rupture.* Decreased air entry implies collection of esophageal contents and pleural effusion on that side.* Naclerio's V sign- Presence of V shaped Gas shadow near Cardiophrenic angle on left side in Boerhaave syndrome Esophagus rupture.* Mackler's triad- Vomiting, Chest pain and Subcutaneous emphysema in Barotrauma Esophagus.", 'role': 'assistant'}]