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 patient in ICU has normal pulmonary A pressure; low systemic peripheral resistance; low cardiac index; arterial PO2 = 93; diagnostic possibilities are - \nSelect and explain. \nA. Cardiogenic shock, B. Septic shock, C. Cardiac tamponade, D. ATN', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]