**Core Concept**
Transplantation of an organ at a site other than its original location is a surgical procedure where a donor organ is transferred to a recipient's body. This procedure is performed to replace a non-functional or damaged organ with a healthy one.

**Why the Correct Answer is Right**
The correct term for this procedure is "heterotopic transplantation," where an organ is transplanted to a different location within the body. This type of transplantation is often used in cases where the original organ cannot be used due to damage or disease. For example, a heterotopic heart transplant involves transplanting a donor heart into a recipient's chest cavity, but not in its original location.

**Why Each Wrong Option is Incorrect**
* **Option A:** Autotransplantation refers to the transplantation of an organ or tissue from one part of the body to another within the same individual. This is not the correct term for transplanting an organ to a different location within the body.
* **Option B:** Isograft refers to a transplant between genetically identical individuals, such as twins. This term does not describe the location of the transplant.
* **Option C:** Xenograft refers to a transplant between different species. This term is not relevant to the location of the transplant.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that heterotopic transplantation is a type of organ transplantation where the organ is transplanted to a different location within the body, often due to damage or disease of the original organ.

**Correct Answer:** C. Heterotopic transplantation.