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
"Golden S" sign is seen in: 
Select and explain. 
A. Right upper lobe collapse, B. Left upper lobe collapse, C. Right middle lobe, D. Lower lobe collapse
A: Right upper lobe collapse
Answer: A: Right upper lobe collapse 
Explanation: Ans. Right upper lobe collapse