**Core Concept**
The question pertains to the identification of a snake based on its neurotoxin content. Neurotoxins are a type of venom that primarily affect the nervous system, causing respiratory failure, paralysis, and eventually death. This concept is crucial in forensic medicine, where the identification of venomous snakes and the determination of their venom types are vital in post-mortem examinations.

**Why the Correct Answer is Right**
Kraits (Bungarus spp.) are a genus of venomous snakes belonging to the family Elapidae. They are characterized by their neurotoxic venom, which primarily targets the nervous system. The venom of kraits contains a potent neurotoxin called bungarotoxin, which blocks the release of acetylcholine at the neuromuscular junction, leading to muscle paralysis and respiratory failure. This makes kraits one of the most venomous snakes in the world, and their neurotoxic venom is a key factor in their deadly potential.

**Why Each Wrong Option is Incorrect**
**Option A:** Vipers (Vipera spp.) are a genus of venomous snakes belonging to the family Viperidae. They are characterized by their hemotoxic venom, which primarily targets the circulatory system, causing hemorrhaging, necrosis, and renal failure. Vipers do not possess neurotoxic venom, making them an incorrect choice.

**Option C:** Sea snakes (Hydrophiinae) are a subfamily of venomous snakes belonging to the family Elapidae. They are characterized by their hemotoxic and myotoxic venom, which primarily targets the circulatory and muscular systems, causing renal failure and muscle damage. Sea snakes do not possess neurotoxic venom, making them an incorrect choice.

**Option D:** This option is incorrect because kraits are indeed a type of snake that possesses neurotoxic venom.

**Clinical Pearl / High-Yield Fact**
In forensic medicine, the identification of snake venom is crucial in determining the cause of death. Neurotoxic venom, such as that of kraits, can be distinguished from hemotoxic venom by the presence of symptoms such as respiratory failure, paralysis, and cardiac arrest. This is a critical distinction to make in post-mortem examinations, as it can provide valuable information about the circumstances surrounding the death.

**✓ Correct Answer: B. Krait**