## **Core Concept**
Lithotripsy is a medical procedure that uses shock waves to break up stones in the kidney, bladder, or ureter. The effectiveness of lithotripsy depends on the composition of the stone, with some types being more responsive to shock wave therapy than others.

## **Why the Correct Answer is Right**
The correct answer, **C. Calcium stone (specifically, Calcium oxalate stones are less responsive but among given options, this seems to relate to common stones)**, but more accurately **C. Struvite stones or sometimes referred in context as related to uric acid stones** aren't explicitly listed; **C. Uric acid stones** are particularly sensitive to lithotripsy. Uric acid stones are often softer and more amenable to shock wave lithotripsy compared to harder stones like calcium oxalate stones.

## **Why Each Wrong Option is Incorrect**
- **Option A:** Cystine stones are relatively hard and less responsive to lithotripsy.
- **Option B:** Calcium stones, particularly calcium oxalate stones, are common but somewhat harder and less sensitive to lithotripsy compared to uric acid stones.
- **Option D:** While not detailed, if implying another type, generally, mixed or harder stone compositions are less responsive.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that **uric acid stones** are not only more sensitive to lithotripsy but also can often be prevented or dissolved with medical treatment, specifically by **alkalinizing the urine**. This makes understanding stone composition crucial for management.

## **Correct Answer:** **C. Uric acid stone**