**Question:** Cocket & Dodd's operation is performed for which one of the following?

A. Treatment of chronic renal failure
B. Management of chronic obstructive pulmonary disease (COPD)
C. Correction of a congenital diaphragmatic hernia
D. Treatment of severe aortic stenosis

**Correct Answer:** C. Correction of a congenital diaphragmatic hernia

**Core Concept:** Cocket & Dodd's operation is a surgical procedure primarily used to correct a congenital diaphragmatic hernia (CDH), which is a rare developmental defect. CDH occurs when the diaphragm does not form properly in the fetus, leading to an abnormal herniation of abdominal organs into the thoracic cavity.

**Why the Correct Answer is Right:** Cocket & Dodd's operation, also known as the "diaphragmatic plication," aims to strengthen and tighten the weakened or absent diaphragm in CDH patients. The surgery involves suturing the edges of the diaphragmatic defect together to reduce the herniated contents and restore normal lung development.

**Why Each Wrong Option is Incorrect:**

A. Treatment of chronic renal failure (CRF) is unrelated to Cocket & Dodd's operation. CRF is a common end-stage renal disease caused by various factors, and its management focuses on supportive care, dialysis, or transplantation, not surgical interventions on the diaphragm.

B. Management of chronic obstructive pulmonary disease (COPD) is not the purpose of Cocket & Dodd's operation. COPD is a progressive lung disease characterized by airflow limitation, whereas the operation is targeted at congenital diaphragmatic hernia, a separate condition affecting lung development.

D. Treatment of severe aortic stenosis is unrelated to Cocket & Dodd's operation. Aortic stenosis is a heart valve disorder, while the operation addresses a congenital diaphragmatic defect affecting lung development.

**Clinical Pearl:** Cocket & Dodd's operation is a crucial intervention for CDH patients, as it directly addresses the underlying cause of impaired lung development and improves survival rates and long-term outcomes in affected infants.