**Core Concept**
Aconite poisoning is a toxic condition caused by the ingestion of aconitum plants or their extracts, leading to the disruption of cardiac and nervous system function. Aconite's toxic effects are primarily due to the inhibition of sodium-potassium ATPase and the stimulation of cardiac vagal receptors.

**Why the Correct Answer is Right**
Aconite poisoning is characterized by its unique set of symptoms, including nausea, vomiting, abdominal pain, and cardiac arrhythmias. The cardiac effects of aconite are primarily due to its ability to stimulate the vagus nerve, leading to a decrease in heart rate and an increase in the refractory period of the heart. Additionally, aconite's toxic effects can also lead to respiratory depression, neurological symptoms such as numbness and tingling, and gastrointestinal symptoms such as diarrhea and abdominal pain.

**Why Each Wrong Option is Incorrect**
* **Option A:** Aconite poisoning is indeed characterized by gastrointestinal symptoms such as nausea and vomiting, making this option incorrect.
* **Option B:** Aconite's toxic effects can lead to cardiac arrhythmias, making this option incorrect.
* **Option C:** Aconite poisoning is not typically characterized by seizures, making this option incorrect.

**Clinical Pearl / High-Yield Fact**
Aconite poisoning is often referred to as "queen of poisons" due to its potent and rapid onset of symptoms. It is essential to note that aconite's toxic effects can be reversed with supportive care, including the administration of activated charcoal and cardiac monitoring.

**Correct Answer: D. Seizures**