This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thoracic Outlet Syndrome, Subject name: Surgery
[{'content': 'All of the following are features of SVC Syndrome except- \nSelect and explain. \nA. Facial swelling, B. Dilatation and congestion of neck veins, C. Headache, D. Hoarseness of voice', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., H'oarseness of voice SVC Syndromeo Superior vena cava syndrome (SVCS), is a group of symptoms caused by obstruction of the superior vena cava (a short, wide vessel carrying circulating blood into the heart). More than 90% of cases of superior vena cava obstruction are caused by cancer - most commonly bronchogenic carcinomaSigns and symptomso Shortness of breath is the most common symptom, followed by face or arm swellingo Following are frequent symptoms:# Difficulty breathing# Headache# Facial swelling# Venous distention in the neck and distended veins in the upper chest and arms# Upper limb edema# Lightheadedness# Cough# Edema (swelling) of the neck, called the collar of Stokes# Pemberton's sign", 'role': 'assistant'}]