## **Core Concept**
The association between carcinoma of the gallbladder and gallstones is a well-established clinical correlation. Carcinoma of the gallbladder is a malignancy that arises from the epithelial lining of the gallbladder, and gallstones (cholelithiasis) are a significant risk factor for its development.

## **Why the Correct Answer is Right**
The correct answer indicates that the association of carcinoma of the gallbladder with gallstones is about 70-80%. This high percentage reflects the strong link between chronic inflammation caused by gallstones and the malignant transformation of gallbladder epithelial cells. The presence of gallstones leads to chronic irritation and inflammation, which over time can result in dysplasia and eventually carcinoma.

## **Why Each Wrong Option is Incorrect**
- **Option A:** 10-20% is significantly lower than the established association between gallstones and carcinoma of the gallbladder, making it an incorrect option.
- **Option B:** 30-40% underestimates the strong correlation between gallstones and the development of gallbladder carcinoma.
- **Option D:** 90-100% overestimates the association, as not all cases of gallbladder carcinoma are associated with gallstones; other risk factors include porcelain gallbladder, anomalous pancreaticobiliary ductal junction, and Salmonella typhi infection.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that while the majority of patients with gallstones do not develop gallbladder cancer, the presence of gallstones significantly increases the risk of developing this malignancy. The risk is particularly increased in cases of large stones (>3 cm) and in patients with a long-standing history of gallstones.

## **Correct Answer:** . 70-80%