**Core Concept**
Dohlmann's procedure is a technique used in the management of pilonidal sinus disease. This involves the excision of the pilonidal sinus tract and primary closure of the wound. The procedure is often performed to treat chronic pilonidal sinus disease that has not responded to conservative treatment.

**Why the Correct Answer is Right**
Dohlmann's procedure is typically performed in the supine position. This allows for easier access to the pilonidal area and enables the surgeon to excise the entire sinus tract. The supine position also facilitates the primary closure of the wound, which is a key component of the procedure.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because Dohlmann's procedure is not typically performed in the prone position. The prone position may be used for other procedures involving the pilonidal area, but it is not the preferred position for Dohlmann's procedure.
**Option B:** This option is incorrect because Dohlmann's procedure is not typically performed in the lithotomy position. The lithotomy position is often used for procedures involving the perineum, but it is not the preferred position for Dohlmann's procedure.
**Option C:** This option is incorrect because Dohlmann's procedure is not typically performed in the Trendelenburg position. The Trendelenburg position is often used for procedures involving the abdominal cavity, but it is not the preferred position for Dohlmann's procedure.

**Clinical Pearl / High-Yield Fact**
It is essential to note that Dohlmann's procedure is not suitable for all patients with pilonidal sinus disease. Patients with complex or recurrent disease may require more extensive surgical intervention, such as the Karydakis procedure or the Limberg flap.

**Correct Answer: B.**