In which disease, gums comes out from plants :

Options

A. Dieback
B. Necrosis
C. Internal cork of apple
D. Exantherma

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about a disease in which gums come out from plants. We need to identify the correct disease from the provided options.

2. **Analyzing the Options**:
- **Diabetic Necrosis**: This disease is common in woody plants and is caused by copper deficiency. It leads to the progressive death of branches, twigs, shoots, and roots, but does not involve gum formation.
- **Necrosis**: This refers to the death of tissues, specifically leaf tissues, and is caused by deficiencies in calcium, magnesium, potassium, and copper. Again, this does not involve gum production.
- **Internal Cork of Apple**: This disease is caused by boron deficiency and results in cork formation on both the internal and external sides of the apple. It does not involve gum formation.
- **Exanthema**: This disease is caused by copper deficiency and is characterized by the yielding of gums on the bark, particularly in fruit trees.

3. **Identifying the Correct Answer**: Based on the analysis, the disease that causes gums to come out from plants is **Exanthema**. This is the only option that specifically mentions gum production.

4. **Conclusion**: The correct answer to the question is **Exanthema**.