**Question:** Fatal period in sulphuric acid poisoning is -

A. 2-4 hours
B. 4-6 hours
C. 6-8 hours
D. 8-12 hours

**Core Concept:**
Sulphuric acid is a highly corrosive substance that can cause severe burns and tissue damage upon contact or ingestion. In poisoning cases, the severity of the injury leads to a cascade of events involving acid-base balance, electrolyte imbalances, and organ dysfunction. Sulphuric acid poisoning is characterized by an initial rapid period of intense pain, tissue necrosis, and acidosis, followed by a slower phase of inflammation, fibrosis, and scarring.

**Why the Correct Answer is Right:**
The correct answer, **D. 8-12 hours**, refers to the late phase of sulphuric acid poisoning, where the toxic effects become more pronounced and can lead to organ dysfunction and failure. In this phase, the acid-base disturbances and electrolyte imbalances worsen, resulting in acute renal failure, respiratory failure, and cardiovascular collapse. The late phase has a higher risk of fatality compared to the initial phase.

**Why Each Wrong Option is Incorrect:**
A. **2-4 hours**: This option falls within the initial phase of poisoning, where symptoms are more about severe pain and tissue necrosis. During this period, the risk of organ dysfunction and fatality is lower.
B. **4-6 hours**: Similar to option A, this choice falls within the initial phase. The risk of organ failure and fatality is higher in the late phase.
C. **6-8 hours**: This option also refers to the initial phase, where symptoms are more about tissue necrosis and pain. Fatality is more likely in the late phase due to organ dysfunction.

**Clinical Pearl:**
In cases of sulphuric acid poisoning, it is essential to promptly seek medical attention and initiate supportive care. The late phase (8-12 hours) is more likely to cause organ failure and fatality, as it is characterized by the worsening of acid-base disturbances, electrolyte imbalances, and organ dysfunction. Timely management, including gastric lavage, symptomatic treatment, and supportive care, can reduce the risk of fatality.