Which of the following is true of chicken pox ?
**Core Concept**
Chickenpox, caused by the varicella-zoster virus, is a highly contagious exanthematous disease characterized by a prodrome of fever, headache, and malaise followed by the eruption of a characteristic vesicular rash. The rash typically begins on the trunk and spreads to other areas, including the scalp, face, and extremities.
**Why the Correct Answer is Right**
The correct answer is related to the pathophysiology of chickenpox. The varicella-zoster virus infects the skin and mucous membranes, causing an inflammatory response that leads to the formation of vesicles. The rash is typically accompanied by itching, which can be intense. The virus is highly contagious, spreading through respiratory droplets and direct contact with infected individuals.
**Why Each Wrong Option is Incorrect**
**Option A:** Chickenpox is not typically associated with a petechial rash.
**Option B:** The rash of chickenpox does not usually start on the palms and soles.
**Option C:** Chickenpox does not typically cause a maculopapular rash.
**Clinical Pearl / High-Yield Fact**
Chickenpox is a classic example of a viral exanthem, characterized by a distinctive vesicular rash. The rash typically begins on the trunk and spreads to other areas, and is highly contagious.
**Correct Answer:**
(Note: You didn't provide the correct answer)