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
Pneumothorax is best demonstrated by taking a radiograph, with patient in: 
Select and explain. 
A. Mid inspiration, B. End expiration, C. Full inspiration, D. Supine
B: End expiration
Answer: B: End expiration 
Explanation: Ans. End expiration