This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Radiology
Which one of the following is the most likely diagnosis from this x-ray? 
Select and explain. 
A. Right hydropneumothorax, B. Perforated abdominal viscus, C. Right pleural effusion, D. Hydatid cyst right lung
A: Right hydropneumothorax
Answer: A: Right hydropneumothorax 
Explanation: .