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
Sea shore sign on USG is see in 
Select and explain. 
A. Pneumo thorax, B. Normal lung, C. Pleural effusion, D. Pulmonary edema
B: Normal lung
Answer: B: Normal lung 
Explanation: Sea shore sign - Normal lung.
Loss of this pattern (stratosphere sign) - Pneumothorax.