**Core Concept**
The National Vector Borne Disease Control Program (NVBDCP) is a government initiative aimed at preventing and controlling vector-borne diseases in India. The program includes a range of diseases caused by vectors such as mosquitoes, ticks, and fleas.

**Why the Correct Answer is Right**
Yellow fever is not included in the NVBDCP, as it is not a significant public health concern in India. The primary focus of the program is on diseases such as malaria, dengue, Japanese encephalitis, kala-azar, and chikungunya, which have a higher prevalence and impact in the country. Yellow fever is a viral disease transmitted by the bite of an infected mosquito, but it is not endemic to India and is considered a rare importation.

**Why Each Wrong Option is Incorrect**
**Option A:** Malaria is a major public health concern in India and is included in the NVBDCP. It is caused by Plasmodium parasites transmitted through the bite of an infected Anopheles mosquito.
**Option C:** Japanese encephalitis is a significant cause of viral encephalitis in India and is included in the NVBDCP. It is caused by a flavivirus transmitted through the bite of an infected Culex mosquito.
**Option D:** Kala-azar, also known as visceral leishmaniasis, is a major public health concern in India and is included in the NVBDCP. It is caused by Leishmania parasites transmitted through the bite of an infected sandfly.

**Clinical Pearl / High-Yield Fact**
The NVBDCP emphasizes integrated vector management (IVM) strategies, which include a combination of measures such as surveillance, control of breeding sites, use of insecticides, and promotion of personal protective measures. Understanding the role of IVM in disease control is essential for public health professionals.

**✓ Correct Answer: B. Yellow fever**