Symptoms of an allergy can be readily reduced by the use of all , except

Options

A. histamine
B. cortisol
C. adrenaline
D. anti-histamine

Answer

To solve the question regarding which substance does not help reduce allergy symptoms, we need to analyze each option provided:

1. **Histamine (Option A)**: Histamine is a chemical released by the immune system during an allergic reaction. It contributes to the symptoms of allergies, such as itching, swelling, and redness. Therefore, using histamine would not reduce allergy symptoms; it would actually exacerbate them.

2. **Cortisol (Option B)**: Cortisol is a steroid hormone that can help reduce inflammation and suppress the immune response. It is often used in treating allergic reactions and can help alleviate symptoms.

3. **Adrenaline (Option C)**: Adrenaline (or epinephrine) is used in severe allergic reactions (anaphylaxis) to quickly reduce symptoms by constricting blood vessels and opening airways. It is effective in treating acute allergic reactions.

4. **Antihistamines (Option D)**: Antihistamines are medications specifically designed to block the action of histamine. They are commonly used to relieve allergy symptoms, making them effective in managing allergic reactions.

Based on this analysis, the substance that does not help reduce allergy symptoms is:

**Answer: A. Histamine**