**Question:** Dark brown post mortem lividity is seen in-

A. Early stage
B. Late stage
C. Deep seated vessels
D. Superficial vessels

**Core Concept:** Post mortem lividity is the discoloration of the skin that occurs due to pooling of blood in dependent areas following death. It is caused by the inability of the heart to pump blood effectively and the subsequent gravity-dependent accumulation of blood in the lower body.

**Why the Correct Answer is Right:**
Post mortem lividity is primarily seen in the late stage, as the rigor mortis has passed and the blood is no longer being pumped into the dependent areas by the dying or deceased person's heart. In this stage, the blood has had enough time to settle and develop the dark brown color due to the breakdown of hemoglobin into its constituent parts, mainly methemoglobin, which results in the brownish discoloration.

**Why Each Wrong Option is Incorrect:**

A. Early stage: Lividity does not typically occur in the early stage, as rigor mortis is present and the blood is being pumped into the dependent areas by the working heart.
B. Early stage: Similar to option A, blood accumulation is less likely in the early stage due to rigor mortis and active pumping of blood by the heart.
C. Deep seated vessels: Post mortem lividity is related to the body's overall condition and the time elapsed since death, rather than the depth of the vessels.
D. Late stage: The correct answer, as mentioned earlier, where the blood has settled and accumulated in the dependent areas due to the lack of cardiac output.

**Clinical Pearl:** The color of post mortem lividity can provide valuable information regarding the time since death. The darker the color, the longer the body has been deceased. This is an important aspect in forensic medicine for estimation of post-mortem interval and estimation of time since death.

**Correct Answer:** D. Late stage