Viper snake occurs in -a) Hematotoxicb) Vasculotoxicc) Myotoxicd) Hepatotoxice) Neurotoxic

**Core Concept**
Viper snake venom is a complex mixture of enzymes and proteins that can cause various systemic and local effects. The key concept here is the classification of snake venom based on its primary mechanism of action.

**Why the Correct Answer is Right**
Viper snake venom is primarily **vasculotoxic**, meaning it causes damage to blood vessels, leading to hemorrhage, necrosis, and edema. This is due to the presence of phospholipase A2 enzymes, which disrupt the integrity of blood vessel walls. **Option A (Hematotoxic)** is incorrect because, although viper venom can affect blood components, its primary action is not on blood cells. **Option C (Myotoxic)** is incorrect because viper venom does not primarily cause muscle damage. **Option D (Hepatotoxic)** is incorrect as viper venom does not primarily affect liver function. **Option E (Neurotoxic)** is incorrect because viper venom does not primarily affect the nervous system.

**Why Each Wrong Option is Incorrect**
* **Option A:** Hematotoxic effects are more characteristic of certain cobra and krait venoms, which can cause coagulopathy and platelet dysfunction.
* **Option C:** Myotoxic effects are more characteristic of certain cobra and krait venoms, which can cause muscle necrosis and weakness.
* **Option D:** Hepatotoxic effects are more characteristic of certain viper and rattlesnake venoms, which can cause liver damage and dysfunction.
* **Option E:** Neurotoxic effects are more characteristic of certain cobra, krait, and coral snake venoms, which can cause paralysis and respiratory failure.

**Clinical Pearl / High-Yield Fact**
Viper snake venom can cause significant systemic effects, including renal failure, cardiovascular collapse, and coagulopathy. Prompt medical attention and antivenom administration are essential in managing viper snake bites.

**Correct Answer: B. Vasculotoxic**