This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S., Subject name: Medicine
[{'content': 'A 45-year-old man presents with exertional dyspnea and pitting pedal edema. His neck veins are dilated. A diagnosis of superior vena cava (SVC) syndrome is made. What will you do next? \nSelect and explain. \nA. Do total blood count and peripheral smear, B. Do a CT chest, C. Start cyclophosphamide, D. Start radiotherapy', 'role': 'user'}, {'content': 'Answer: B \nExplanation: ANS. BThis shows an approach to a case of SVC syndrome which clearly says that first step is CT chest with contrast. This helps us to arrive at a cause for SVC syndrome and treat accordingly.Various causes of SVC syndrome are:', 'role': 'assistant'}]