Which of the following is NOT a symptom of allergy?

Metastasis.

The correct answer is Option (4) → Metastasis.

The symptoms of allergy typically include:

• Sneezing (immune response to allergens)
• Watery eyes (irritation from allergens)
• Runny nose (due to histamine release)

Metastasis is NOT related to allergies. It refers to:

• The spread of cancer cells from one part of the body to another (e.g., malignant tumors).
• This is a cancer-related process, completely unrelated to allergic reactions.

All other options (sneezing, watery eyes, runny nose) are classic allergy symptoms caused by histamine release in response to allergens (pollen, dust, etc.).

Final Answer:

Metastasis is the correct choice as it is not an allergy symptom.