Which of the following is not useful in reducing the symptoms of allergy

Options

A. Steroids
B. Anti histamines
C. Adrenalin
D. Histamines

Answer

To determine which of the following options is not useful in reducing the symptoms of allergy, let's analyze each option provided:

1. **Steroids**: These are anti-inflammatory medications that can help reduce the immune response and alleviate symptoms associated with allergies. They are often prescribed for severe allergic reactions.

2. **Antihistamines**: These medications block the action of histamine, a substance in the body that causes allergic symptoms. Antihistamines are commonly used to relieve symptoms such as itching, sneezing, and runny nose.

3. **Adrenaline**: Also known as epinephrine, this is used in severe allergic reactions (anaphylaxis) to quickly reduce symptoms by constricting blood vessels and opening airways.

4. **Histamine**: This is the substance that the body releases during an allergic reaction, causing symptoms like itching and swelling. It is not a treatment for allergies; rather, it is the cause of the symptoms.

Based on this analysis, the option that is not useful in reducing the symptoms of allergy is:

**Answer: Histamine (Option D)**

### Step-by-Step Solution:
1. **Identify the options**: Steroids, Antihistamines, Adrenaline, Histamine.
2. **Understand the role of each option**:
- Steroids reduce inflammation.
- Antihistamines block histamine action.
- Adrenaline treats severe allergic reactions.
- Histamine causes allergic symptoms.
3. **Determine which option does not help**: Histamine is not a treatment; it is the substance causing the allergic response.
4. **Conclude the answer**: Histamine (Option D) is not useful in reducing allergy symptoms.