How many from the following are non - curable viral diseases in humans ?
( Syphilis, Genital herpes, chlamydiasis, Hepatitis - B,Gonorrhoea, Trichomoniasis, AIDS )

Options

A. Four
B. Three
C. Two
D. Five

Answer

To determine how many of the listed diseases are non-curable viral diseases in humans, we will analyze each disease mentioned in the question:

1. **Syphilis**: This is a bacterial infection caused by Treponema pallidum. It is curable with appropriate antibiotic treatment.

2. **Genital Herpes**: This is caused by the herpes simplex virus (HSV). It is a viral infection that is not curable, but its symptoms can be managed with antiviral medications.

3. **Chlamydiasis**: This is a bacterial infection caused by Chlamydia trachomatis. It is curable with antibiotics.

4. **Hepatitis B**: This is caused by the Hepatitis B virus (HBV). It is a viral infection that can lead to chronic disease and is not completely curable, although treatments can help manage the infection.

5. **Gonorrhoea**: This is a bacterial infection caused by Neisseria gonorrhoeae. It is curable with antibiotics.

6. **Trichomoniasis**: This is caused by a protozoan parasite (Trichomonas vaginalis). It is curable with specific medications.

7. **AIDS**: This is caused by the Human Immunodeficiency Virus (HIV). It is a viral infection that is not curable, but antiretroviral therapy can help manage the disease.

Now, let's summarize the findings:

- Non-curable viral diseases from the list:
- Genital Herpes
- Hepatitis B
- AIDS

Thus, there are **three non-curable viral diseases** in the provided list.

### Final Answer:
The number of non-curable viral diseases in humans from the list is **3**.