**Core Concept**
Dengue transmission involves the bite of an infected female mosquito, primarily of the species Aedes aegypti and Aedes albopictus. This process is facilitated by the mosquito's saliva, which contains viral particles.

**Why the Correct Answer is Right**
The correct answer is related to the pathogenesis of dengue fever. When an infected female mosquito bites a human, she injects saliva containing the virus into the bloodstream. The virus then replicates within the host, causing symptoms such as fever, headache, and hemorrhaging. The Aedes species mosquitoes are the primary vectors of dengue virus, and their saliva plays a crucial role in transmitting the virus to humans.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not specify the type of mosquito involved in dengue transmission. While other mosquito species may be capable of transmitting various diseases, the Aedes species are specifically associated with dengue fever.
* **Option B:** This option is incorrect because it does not accurately describe the mode of transmission. Dengue is not transmitted through direct contact with an infected person or contaminated food and water.
* **Option C:** This option is incorrect because it is not a specific mode of transmission. While dengue can be transmitted through various routes, the primary mode of transmission is through the bite of an infected mosquito.

**Clinical Pearl / High-Yield Fact**
It is essential to note that Aedes mosquitoes are active during the day and tend to rest in dark, shaded areas, making them more likely to bite humans in these environments.

**Correct Answer:** B. Mosquito bite