## Core Concept
Pyuria in children refers to the presence of white blood cells (leukocytes) in the urine, which is often indicative of a urinary tract infection (UTI). UTIs in children can manifest with or without symptoms, and their diagnosis involves urinalysis and culture. Understanding the implications of pyuria is crucial for the appropriate management of UTIs.

## Why the Correct Answer is Right
The correct answer implies that one of the statements provided regarding pyuria in children does not hold true. Without the specific statements provided in the query, a general approach to evaluating the truthfulness of statements about pyuria involves considering the definition, causes, clinical presentation, and diagnostic criteria for UTIs and pyuria in children. Typically, pyuria is a significant finding that warrants further investigation and possible antibiotic treatment.

## Why Each Wrong Option is Incorrect
- **Option A:** Without the specific details of option A, one can infer that if it suggests a true statement about pyuria (e.g., pyuria is indicative of UTI, or it is more common in girls), then it would not be the incorrect statement.
- **Option B:** Similarly, if option B presents a generally accepted fact about pyuria or UTIs in children (e.g., the importance of urine culture for diagnosis), it would be correct and not the answer.
- **Option C:** This option would also be incorrect if it aligns with established medical knowledge regarding pyuria.
- **Option D:** As with the others, without specifics, one assumes it could be incorrect based on the question stem.

## Clinical Pearl / High-Yield Fact
A key point to remember is that the presence of pyuria in a child warrants a thorough evaluation for UTI, including a urine culture to guide antibiotic therapy. Additionally, clinicians must consider the clinical presentation, such as fever, dysuria, or abdominal pain, when interpreting pyuria.

## Correct Answer: D.