**Core Concept**
The question is testing the knowledge of a drug that has both spasmolytic activity and can be used in the management of seizures caused by local anesthetic overdose. This requires an understanding of the pharmacological properties of various drugs, particularly those used in anesthesia and neurology.

**Why the Correct Answer is Right**
The correct answer is **Baclofen**. Baclofen is a GABA_B receptor agonist, which means it activates the inhibitory neurotransmitter GABA in the central nervous system. This leads to muscle relaxation and spasmolytic activity. Additionally, baclofen can also be used to manage seizures caused by local anesthetic overdose due to its ability to stabilize neuronal membranes and reduce excitatory neurotransmitter release.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not match the description of a drug with spasmolytic activity and seizure management properties.
* **Option C:** This option is incorrect because it does not have the specific pharmacological properties required to manage seizures caused by local anesthetic overdose.

**Clinical Pearl / High-Yield Fact**
Baclofen is often used in the management of spasticity in conditions such as multiple sclerosis, but its use in seizure management is less well-known. It's essential to remember that baclofen can be used in a variety of clinical scenarios beyond its primary indication.

**Correct Answer:** B. Baclofen