A nurse is teaching a group of clients about the risk factors for developing cholelithiasis. Which client is at the highest risk for developing gallstones?

A 50-year-old male with a history of chronic alcohol use and smoking

A 30-year-old male who exercises regularly and eats a low-fat diet

A 25-year-old female who takes oral contraceptives and consumes a high-protein diet

A 42-year-old female who is obese and has a history of multiple pregnancies