**Core Concept**
The Virchow method of organ removal is a technique used in forensic pathology to facilitate the examination and documentation of organs and tissues during an autopsy. This method involves the systematic removal of organs from the body one by one, allowing for a detailed examination of each organ and its relationship to the surrounding structures.

**Why the Correct Answer is Right**
The Virchow method is a meticulous and systematic approach to organ removal, which enables the pathologist to identify any abnormalities or lesions that may be present. By removing organs one by one, the pathologist can examine each organ in its entirety, including its surface, cut surfaces, and any associated tissues or structures. This allows for a comprehensive understanding of the organ's anatomy and any potential pathology. The Virchow method is particularly useful in cases where the cause of death is unclear or when there are suspicions of foul play.

**Why Each Wrong Option is Incorrect**
**Option A:** Organs removed en masse is not a characteristic of the Virchow method, as it involves the removal of organs in a piecemeal fashion rather than en bloc. This approach can lead to a loss of anatomical relationships and make it more difficult to identify potential pathology.

**Option C:** In-situ dissection involves dissecting tissues and organs within the body cavity, rather than removing them entirely. While in-situ dissection can be useful in certain situations, it is not the primary approach used in the Virchow method.

**Option D:** En-block removal of viscera involves removing multiple organs together as a single block, which can be useful in certain situations but is not the characteristic approach of the Virchow method.

**Clinical Pearl / High-Yield Fact**
One key aspect of the Virchow method is the importance of maintaining the anatomical relationships between organs and tissues. This involves careful dissection and removal of organs to preserve their natural relationships, which can be critical in the investigation of certain types of trauma or disease.

**✓ Correct Answer: B. Organs removed one by one.**