**Core Concept**
Poliovirus is a highly infectious agent that causes poliomyelitis, a disease characterized by the invasion of neurons by the virus, leading to muscle weakness, paralysis, and sometimes death. The virus primarily affects the anterior horn cells of the spinal cord, resulting in flaccid paralysis.

**Why the Correct Answer is Right**
The correct answer is related to the pathogenesis of poliovirus. After entering the body through the oral-fecal route, poliovirus multiplies in the gut and can invade the central nervous system (CNS) through a process called retrograde axonal transport. Once inside the CNS, the virus targets and destroys the motor neurons in the anterior horn of the spinal cord, leading to muscle weakness and paralysis.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not accurately describe the primary mechanism of poliovirus entry into the CNS.
**Option B:** This option is incorrect as it is not a characteristic of poliovirus infection.
**Option C:** This option is incorrect as it is not a true statement about poliovirus.

**Clinical Pearl / High-Yield Fact**
Poliovirus infection can lead to three forms of poliomyelitis: non-paralytic (mild), paralytic (severe), and bulbar poliomyelitis (involving the brainstem). The bulbar form is often fatal.

**Correct Answer:** Not provided.