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
Cause of Unilateral Hypertranslucent hemithorax 
Select and explain. 
A. Pleural effusion, B. Pneumonectony, C. Poland's syndrome, D. Collapse
C: Poland's syndrome
Answer: C: Poland's syndrome 
Explanation: Poland's (U/L congenital absence of pectoral muscles) - thus hypertransluscency.