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': 'Which of the following is not a feature of mediastinal syndrome \nSelect and explain. \nA. Dysphagia, B. Intercostal neuralgia, C. Hoarseness of voice, D. Engorgement of Veins in lower half of body', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Mediastinal syndrome other name for SVC syndrome or It involves veins of upper half of body.', 'role': 'assistant'}]