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: Surgery
Following is true of eventration of diaphragm -a) It is a developmental defectb) Early surgery is treatmentc) Defect is usually musculard) Diagnosed mostly clinically 
Select and explain. 
A. a, B. ac, C. ad, D. b
B: ac
Answer: B: ac 
Explanation: • Abnormally elevated position of diaphragm from paralysis or atrophy of the muscle fibers.
• May be congenital anomaly caused by failure of muscularization of the dome of hemidiaphragm, or it may be acquired as a result of dysfunction of the phrenic nerve related to the neuromuscular disease or trauma including operative trauma.
• Birth trauma: MC cause of acquired diaphragmatic eventration, usually related to breech presentation.
• Most commonly diagnosed in pediatric patients
• More common in males and affect left hemidiaphragm more frequently.
Treatment
• Diaphragmatic plication is preferred over resection.
• Surgery to fix the diaphragm in inspiration so the paradoxical movement and mediastinal shift are minimized.