To determine which sexually transmitted disease (STD) is curable when detected early, we will analyze the options provided in the question.
### Step-by-Step Solution:
1. **Identify the Diseases**: The question refers to sexually transmitted diseases (STDs) and asks which one is curable when detected early. The diseases mentioned include genital herpes, hepatitis B, HIV, chlamydiasis, syphilis, genital warts, gonorrhea, and trichomoniasis.
2. **Analyze Each Disease**:
- **Genital Herpes**: Caused by the herpes simplex virus. This disease is not curable; it can only be managed with antiviral medications.
- **Hepatitis B**: Caused by the hepatitis B virus (HBV). This disease is also not curable, and treatment focuses on managing symptoms.
- **HIV**: Caused by the human immunodeficiency virus. This is not curable and leads to AIDS, with treatment aimed at managing the condition.
- **Chlamydiasis**: Caused by Chlamydia trachomatis. This disease is curable with appropriate antibiotic treatment when detected early.
- **Syphilis**: Caused by Treponema pallidum. This disease is also curable with antibiotics, particularly penicillin, when detected early.
- **Genital Warts**: Caused by the human papillomavirus (HPV). While there is no cure for the virus itself, the warts can be treated and removed.
- **Gonorrhea**: Caused by Neisseria gonorrhoeae. This is curable with antibiotics if detected early.
- **Trichomoniasis**: Caused by Trichomonas vaginalis. This is also curable with antibiotics when detected early.
3. **Determine the Curable Diseases**: From the analysis, the diseases that are curable when detected early include:
- Chlamydiasis
- Syphilis
- Gonorrhea
- Trichomoniasis
4. **Conclusion**: The question asks for one of the diseases that is curable when detected early. Based on the analysis, the correct answer is that chlamydiasis, syphilis, and genital warts are curable when detected early.
### Final Answer:
The diseases that are curable when detected early include chlamydiasis, syphilis, and gonorrhea. Therefore, the correct option is **Option 2**.
