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: Medicine
[{'content': 'A 25 year old male collage student present to emergency after road traffic accident.patient is in state of shock and breath sounds are decreased on side of chest trauma (left side).normal heart sound ,no elevated JVP and dull note on percussion. diagnosis? \nSelect and explain. \nA. Tension pneumothorax, B. Cardiac tamponade, C. Massive Hemothorax, D. None', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Patient with chest trauma in shock without elevated JVP suggest massive Hemothorax.', 'role': 'assistant'}]