## Core Concept
Congenital hypertrophic pyloric stenosis (CHPS) is a condition characterized by the thickening of the pyloric muscle, leading to gastric outlet obstruction in infants. This condition typically presents with projectile vomiting, which is non-bilious. The diagnosis is often confirmed by ultrasound.

## Why the Correct Answer is Right
The correct answer, , states that the condition is more common in males, which is a true statement. Congenital hypertrophic pyloric stenosis has a male predominance, with a male-to-female ratio of approximately 4:1 to 6:1. The exact cause is unknown, but it is thought to involve a combination of genetic and environmental factors.

## Why Each Wrong Option is Incorrect
* **Option A:** This option is incorrect because while the typical presentation includes projectile vomiting, it does not specify the characteristic feature of being non-bilious, which is crucial for differentiating it from other causes of vomiting in infants.
* **Option B:** This option is incorrect as it does not accurately represent a universally accepted fact about CHPS, making it less likely to be the correct answer.
* **Option C:** This option might discuss a treatment aspect; however, without specifying what , it is hard to directly refute it, but we know that surgical pyloromyotomy is a definitive treatment.

## Clinical Pearl / High-Yield Fact
A key clinical pearl is that the "olive" sign, representing the hypertrophied pylorus, can often be palpated in the epigastric region of infants with CHPS. This finding, combined with the classic history of projectile, non-bilious vomiting, is highly suggestive of the diagnosis.

## Correct Answer: D. More common in males.