Chikungunya is caused by ?
**Core Concept**
Chikungunya is a viral disease transmitted by the bite of an infected mosquito, primarily the *Aedes* species. The **Chikungunya virus** belongs to the *Togaviridae* family. This disease is characterized by severe joint pain and swelling.
**Why the Correct Answer is Right**
The correct answer is related to the **Alphavirus** genus, which includes the Chikungunya virus. This virus is transmitted through the bite of infected *Aedes aegypti* or *Aedes albopictus* mosquitoes. The **Alphavirus** genus is known for causing diseases that affect the joints.
**Why Each Wrong Option is Incorrect**
**Option A:** Is incorrect because it is not related to the Chikungunya virus.
**Option B:** Is incorrect as it does not belong to the *Togaviridae* family.
**Option C:** Is incorrect because it is not associated with the transmission of Chikungunya.
**Option D:** Is incorrect as it is not the correct classification of the Chikungunya virus.
**Clinical Pearl / High-Yield Fact**
Chikungunya should be differentiated from other **arboviral diseases** like dengue and Zika, as their symptoms can overlap.
**Correct Answer:** D. Alphavirus.