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
X-ray given below suggests 
Select and explain. 
A. Normal x-ray, B. Hydatid cyst, C. ABPA, D. Hydropneumothorax
D: Hydropneumothorax
Answer: D: Hydropneumothorax 
Explanation: The given image shows

Mediastinal shift to opposite side
Clear homogeneous Opacity with horizontal air - fluid level.
Suggestive of hydropneumothorax