**Core Concept**
Aconite poisoning is a form of toxicological emergency caused by the ingestion or absorption of aconitine, a potent neurotoxin and cardiac glycoside found in the Aconitum species of plants, commonly known as monk's hood or wolf's bane. The toxin acts by inhibiting the sodium-potassium ATPase pump, leading to cardiac arrhythmias, neurological symptoms, and other systemic effects.

**Why the Correct Answer is Right**
Aconite poisoning primarily causes cardiac effects, including bradycardia, atrioventricular block, and ventricular fibrillation, due to its action on the cardiac sodium channels. Neurological symptoms include numbness, tingling, and weakness, as well as gastrointestinal symptoms like nausea, vomiting, and abdominal pain. The correct answer is related to the absence of a particular symptom or effect.

**Why Each Wrong Option is Incorrect**
**Option A:** Numbness and tingling are characteristic symptoms of aconite poisoning due to its neurotoxic effects.
**Option B:** Gastrointestinal symptoms like nausea, vomiting, and abdominal pain are common in aconite poisoning.
**Option C:** Cardiac effects like bradycardia and atrioventricular block are typical manifestations of aconite poisoning.

**Clinical Pearl / High-Yield Fact**
Aconite poisoning is often fatal if not treated promptly, and its symptoms can be mistaken for those of other conditions, making it essential to consider this diagnosis in patients with unexplained cardiac arrhythmias or neurological symptoms.

**Correct Answer:** D