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: Radiology
[{'content': '"Golden S" sign is seen in: \nSelect and explain. \nA. Right upper lobe collapse, B. Left upper lobe collapse, C. Right middle lobe, D. Lower lobe collapse', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Right upper lobe collapse', 'role': 'assistant'}]