Which of the following types of mosquitos are now restricted to Andaman and Nicobar islands?
**Core Concept:** Mosquitoes, belonging to the family Anophelinae, are blood-feeding insects that transmit several diseases to humans, such as malaria, filariasis, and dengue fever. In the Andaman and Nicobar islands, these mosquitoes are restricted to specific habitats, including coastal regions and wetlands.
**Why the Correct Answer is Right:** The correct answer refers to the Anopheles mosquito species, which are known to be vectors for malaria. Among the given options, Anopheles stephensi is a mosquito species native to the Andaman and Nicobar islands, making it the correct answer.
**Why Each Wrong Option is Incorrect:**
A. Culex: This refers to the Culex mosquito species, which is primarily associated with transmitting arboviral diseases like Japanese encephalitis, filariasis, and lymphatic filariasis, rather than malaria.
B. Aedes: Aedes mosquitoes are responsible for transmitting diseases like dengue fever, chikungunya, and yellow fever, not malaria.
C. Anopheles: Although some Anopheles species are known to be vectors for malaria, Anopheles stephensi is the correct species specifically mentioned in the question.
D. Tsetse: Tsetse flies transmit trypanosomiasis, also known as African sleeping sickness, not malaria.
**Clinical Pearl:** The Andaman and Nicobar islands are known for malaria transmission due to the presence of suitable Anopheles mosquitoes like Anopheles stephensi. Understanding the local mosquito species is crucial for disease control strategies and public health planning in these regions.