Regarding polio which is true
**Core Concept**
Polio, short for poliomyelitis, is a highly infectious disease caused by the poliovirus, which primarily affects the motor neurons in the spinal cord, leading to muscle weakness, paralysis, and in severe cases, respiratory failure.
**Why the Correct Answer is Right**
The correct answer is related to the pathophysiology of polio. When the poliovirus infects motor neurons, it triggers an immune response that results in the destruction of these cells. This leads to muscle weakness and paralysis, as the motor neurons are responsible for transmitting signals from the central nervous system to the muscles. The virus primarily targets the anterior horn cells of the spinal cord, which are essential for controlling voluntary movements.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the primary site of poliovirus infection.
**Option B:** This option is incorrect because it does not specify the correct mechanism of polio pathogenesis.
**Option C:** This option is incorrect because it is not a direct consequence of polio infection.
**Clinical Pearl / High-Yield Fact**
It is essential to note that polio can lead to a condition known as post-polio syndrome (PPS), which occurs years after the initial infection. PPS is characterized by muscle weakness, fatigue, and atrophy, and it is thought to be caused by the death of motor neurons that occurred during the initial infection.
**Correct Answer:** C.