**Core Concept**
Pyuria refers to the presence of pus in the urine, often indicating a urinary tract infection (UTI). In children, UTIs can present differently than in adults, and understanding the nuances of pyuria is crucial for accurate diagnosis and treatment.

**Why the Correct Answer is Right**
Since the correct answer is not specified, let's discuss the general approach to evaluating pyuria in children. Pyuria is a significant finding that necessitates further investigation, as it may indicate an infection involving the kidneys or lower urinary tract. The presence of white blood cells in the urine is a key diagnostic criterion for UTIs.

**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific statement, it's challenging to address why it might be incorrect.
**Option B:** Similarly, without details, we cannot assess its accuracy.
**Option C:** And **Option D:** lack context to evaluate their correctness.

**Clinical Pearl / High-Yield Fact**
A crucial point to remember is that the diagnosis of a UTI in children should be based on a combination of clinical symptoms (such as dysuria, frequency, and fever) and laboratory findings, including pyuria and bacteriuria.

**Correct Answer:** D. Pyuria is always associated with bacteriuria in children.