**Core Concept**
The question is testing the student's knowledge of substances that have a stimulant effect on the central nervous system, specifically those that are similar to amphetamine. Amphetamine is a synthetic compound that acts as a central nervous system stimulant, increasing levels of dopamine, norepinephrine, and serotonin in the brain.

**Why the Correct Answer is Right**
The correct answer is a non-synthetic alkaloid compound that acts similarly to amphetamine by increasing the release of neurotransmitters such as dopamine and norepinephrine in the brain. This is achieved through its action on the presynaptic neuron, where it inhibits the reuptake of these neurotransmitters, leading to an increase in their concentration in the synaptic cleft.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the substance in question is a non-synthetic alkaloid compound, and amphetamine is a synthetic compound. Therefore, this option does not match the description provided in the question.
**Option B:** This option is incorrect because while the substance in question does have a stimulant effect, it is not a non-synthetic alkaloid compound.
**Option C:** This option is incorrect because the substance in question is a non-synthetic alkaloid compound, and this option describes a different type of compound.

**Clinical Pearl / High-Yield Fact**
The substance in question is often found in plants such as Ephedra sinica and is used as a stimulant in traditional medicine. However, it can also have adverse effects, such as increased heart rate and blood pressure, and is therefore used with caution.

**Correct Answer:** C. Methylphenidate is incorrect. The correct answer is not provided in the options. However, a correct answer could be ephedrine, which is a non-synthetic alkaloid compound that acts similarly to amphetamine.