**Core Concept:** Anaphylaxis is a severe, potentially life-threatening systemic reaction that occurs in response to exposure to an allergen, most commonly food-based like peanuts.

**Why the Correct Answer is Right:** In this case, the patient experiences sudden stridor, hoarseness of voice, tongue swelling, and edematous neck after eating a peanut, indicating a systemic allergic reaction. Anaphylaxis is the most likely diagnosis due to the rapid onset and severity of symptoms. The presence of stridor, hoarseness, tongue swelling, and neck edema are classic signs of anaphylaxis, which is a severe, systemic reaction triggered by an allergen (in this case, peanuts).

**Why Each Wrong Option is Incorrect:**

A. Amiodarone hypersensitivity: This is a reaction to amiodarone, a medication used for arrhythmias, not related to food allergies.
B. Epiglottitis: Epiglottitis is an infection caused by Haemophilus influenzae, not an allergic reaction.
C. Angioedema: Angioedema is a localized swelling of the skin or mucous membranes, whereas the described symptoms involve the upper airway and vocal cords, suggesting a more severe allergic reaction like anaphylaxis.
D. Vasovagal syncope: Vasovagal syncope is a fainting episode due to a drop in blood pressure, not an allergic reaction.

**Clinical Pearl:** Anaphylaxis is a critical emergency situation that requires immediate medical attention. Prompt treatment and avoidance of the trigger (in this case, peanuts) can prevent severe complications and potentially save a patient's life.

**Correct Answer:** D. Angioedema