**Core Concept**
The question tests knowledge of anticholinergic drugs used to reverse the effects of neuromuscular blockers. **Neostigmine** is a key drug in this context, as it is an anticholinesterase inhibitor that increases acetylcholine levels in the neuromuscular junction.

**Why the Correct Answer is Right**
Neostigmine works by inhibiting **acetylcholinesterase**, the enzyme responsible for breaking down acetylcholine. This increase in acetylcholine competes with the neuromuscular blocker, reversing its effect. However, neostigmine has a muscarinic effect, so an anticholinergic like **atropine** or **glycopyrrolate** is often co-administered to prevent muscarinic side effects.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it's not specified, and the correct answer is related to the context of neostigmine and its reversal of neuromuscular blockade.
**Option B:** Incorrect as it is not provided, but typically, other anticholinergics are not used for this purpose.
**Option C:** Incorrect, as this option is unspecified but would not be the correct choice in the context of reversing neuromuscular blockers with an anticholinergic.
**Option D:** Incorrect, as it is not the correct choice, but the actual correct answer involves the use of an anticholinergic in conjunction with neostigmine.

**Clinical Pearl / High-Yield Fact**
Remember, when using neostigmine to reverse neuromuscular blockade, an anticholinergic like glycopyrrolate is often given to mitigate muscarinic side effects. Glycopyrrolate is preferred over atropine in this context due to its faster onset of action.

**Correct Answer:** D. Glycopyrrolate