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: Surgery
[{'content': 'Sitaram a 40-year old man, met with an accident and comes to emergency department with engorged neck veins, pallor, rapid pulse and chest pain Diagnosis is - \nSelect and explain. \nA. Pulmonary Laceration, B. Cardiac tamponade, C. Hemothorax, D. Splenic rupture', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]