**Core Concept**
Lord's and Jaboulay's operation are procedures used in the management of hydrocele, a condition characterized by the accumulation of serous fluid in the tunica vaginalis testis or along the spermatic cord. This condition can lead to swelling and discomfort in the scrotum.

**Why the Correct Answer is Right**
Lord's and Jaboulay's operations are types of surgical procedures that involve the excision of the hydrocele sac. In Lord's procedure, the sac is opened and the fluid is allowed to drain, while in Jaboulay's procedure, the sac is excised. These procedures are often performed to treat primary hydrocele, which is a common condition in middle-aged and elderly men. The aim of these procedures is to remove the sac and prevent further accumulation of fluid, thereby alleviating symptoms.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because Lord's and Jaboulay's operations are not used for the treatment of varicocele, which is a condition involving the enlargement of the pampiniform plexus of veins.
**Option B:** This option is incorrect because these procedures are not used for the treatment of hernia, which involves the protrusion of an organ or tissue through a weakened area in the abdominal wall.
**Option C:** This option is incorrect because these procedures are not used for the treatment of epididymitis, which is a condition characterized by inflammation of the epididymis.

**Clinical Pearl / High-Yield Fact**
It is essential to note that the choice of procedure for hydrocele treatment depends on the size and location of the hydrocele, as well as the patient's overall health.

**Correct Answer: C. Epididymitis**