**Core Concept**
Congenital hydrocele is a benign accumulation of fluid in the tunica vaginalis of the testis, resulting from impaired lymphatic drainage or failure of testicular development. It is common in infants and typically resolves spontaneously by age 2 years. Surgical intervention is indicated only when the hydrocele is large, symptomatic, or persists beyond early childhood.

**Why the Correct Answer is Right**
Herniotomy is the correct procedure for congenital hydrocele because it involves the removal of the sac and the testis, which is appropriate when the hydrocele is large or associated with a hernia. However, in most cases of simple congenital hydrocele, the condition resolves spontaneously. The term "herniotomy" here refers to surgical intervention involving the tunica vaginalis, not a true inguinal hernia. In clinical practice, herniotomy is used when there is a need to remove the sac and testis due to persistent or symptomatic hydrocele. This procedure is especially indicated in cases where the hydrocele is large or associated with testicular abnormalities.

**Why Each Wrong Option is Incorrect**
Option A: Eversion of sac is not a standard or effective treatment for congenital hydrocele and is not performed routinely.
Option B: Excision of sac alone is not recommended as it may lead to testicular atrophy or complications.
Option C: Lord's procedure is a historical term used in older surgical techniques and is not currently recommended for hydrocele.

**Clinical Pearl / High-Yield Fact**
Most congenital hydroceles resolve spontaneously by age 2 years; surgical intervention is only needed if the hydrocele is large (>3 cm), painful, or associated with testicular pathology. Always assess for testicular abnormalities before proceeding to surgery.

✓ Correct Answer: D. Herniotomy