**Core Concept**
The combination clasp is a type of partial denture retention mechanism that combines the advantages of both wrought wire and cast metal clasps. It provides increased stability and resistance to dislodgement, making it a popular choice in removable partial denture design.

**Why the Correct Answer is Right**
The combination clasp consists of a wrought wire clasp that is attached to a cast metal clasp, which is then soldered to the partial denture. This combination provides a secure and stable retention mechanism, allowing the partial denture to withstand various forces and movements. The wrought wire clasp provides flexibility and adaptability, while the cast metal clasp offers strength and rigidity.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the composition of a combination clasp. A wrought wire clasp alone or a cast metal clasp alone would not provide the same level of stability and resistance to dislodgement.
**Option B:** This option is also incorrect because a wrought wire clasp is not typically attached to a metal plate. Instead, it is usually attached directly to the partial denture or a metal clasp.
**Option C:** This option is incorrect because a cast metal clasp is not typically soldered directly to the partial denture. Instead, it is usually soldered to a wrought wire clasp or a metal plate.

**Clinical Pearl / High-Yield Fact**
When designing a combination clasp, it is essential to consider the thickness and flexibility of the wrought wire clasp, as well as the strength and rigidity of the cast metal clasp. A well-designed combination clasp can provide a secure and stable retention mechanism, reducing the risk of partial denture dislodgement.

**Correct Answer: C. A wrought wire clasp that is attached to a cast metal clasp, which is then soldered to the partial denture.