**Core Concept**
Mumps is a viral infection caused by the mumps virus, which belongs to the family Paramyxoviridae, specifically the genus Rubulavirus. The disease is characterized by its incubation period, high secondary attack rate, and the most common complication of aseptic meningitis.

**Why the Correct Answer is Right**
The mumps virus is highly contagious and spreads through respiratory droplets, saliva, and mucus. The virus primarily affects the salivary glands, leading to symptoms such as swelling of the parotid glands, fever, headache, and muscle aches. Aseptic meningitis is a known complication of mumps, resulting from the virus's ability to infect the central nervous system. The live attenuated vaccine available for mumps is indeed the Jeryl Lynn strain, which has been widely used to prevent the disease.

**Why Each Wrong Option is Incorrect**
**Option A:** Measles is caused by the measles virus, which belongs to the family Paramyxoviridae but is a member of the genus Morbillivirus. Measles has a different incubation period and complications compared to mumps.

**Option C:** Rubella, also known as German measles, is caused by the rubella virus, a member of the family Togaviridae. Rubella has a distinct set of symptoms and complications, including a characteristic rash and congenital abnormalities if contracted during pregnancy.

**Option D:** Chickenpox is caused by the varicella-zoster virus, a member of the family Herpesviridae. Chickenpox is characterized by a distinctive rash and has a different incubation period and complications compared to mumps.

**Clinical Pearl / High-Yield Fact**
Mumps is a vaccine-preventable disease, and vaccination is recommended for all children as part of the routine immunization schedule. The Jeryl Lynn strain of the mumps vaccine has been used extensively and has a good safety profile.

✓ Correct Answer: B. Mumps