**Core Concept**
The patient's symptoms of right upper quadrant abdominal pain, localized tenderness, and yellowish skin discoloration suggest obstructive jaundice, which can be caused by gallstones obstructing the common bile duct. The ultrasound examination findings are crucial in diagnosing the associated gallstones.

**Why the Correct Answer is Right**
The correct answer is associated with gallstones in the context of obstructive jaundice. Gallstones can cause obstruction of the common bile duct, leading to elevated bilirubin levels and subsequent jaundice. The ultrasound examination findings in this case show a dilated common bile duct (CBD), which is a hallmark of obstructive jaundice caused by gallstones. The presence of a dilated CBD indicates that the gallstones have obstructed the flow of bile, leading to the patient's symptoms.

**Why Each Wrong Option is Incorrect**
**Option A:** A dilated intrahepatic bile duct would be more indicative of a problem within the liver itself, such as primary biliary cirrhosis or primary sclerosing cholangitis, rather than gallstones causing obstructive jaundice.
**Option C:** A normal-sized CBD would suggest that the gallstones have not caused significant obstruction, which is unlikely given the patient's symptoms of obstructive jaundice.

**Clinical Pearl / High-Yield Fact**
A key point to remember when interpreting ultrasound findings in the context of gallstones is that a dilated CBD is a strong indicator of obstructive jaundice, which is often caused by gallstones. This is a classic exam-trap question that can be solved by understanding the relationship between gallstones and obstructive jaundice.

**Correct Answer Line**
✓ Correct Answer: B. The ultrasound examination findings show a dilated common bile duct, which is consistent with the patient's symptoms of obstructive jaundice caused by gallstones.