**Core Concept**
The Arcon articulator is a type of dental articulator used in prosthodontics to simulate the movements of the mandible. It is characterized by the articulator's condylar assembly being attached to the lower part of the frame, which is an essential distinction from other articulators.

**Why the Correct Answer is Right**
The Arcon articulator's design allows for a more accurate representation of the mandibular movements and the condylar path, which is essential for creating accurate dental prostheses. This is because the condylar assembly is positioned in a way that it closely mimics the actual anatomical relationship between the condyles and the temporal bones. The Arcon articulator is particularly useful for creating prostheses that require precise condylar guidance, such as in cases of severe mandibular atrophy or in patients with a history of TMJ disorders.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the characteristic of an Arcon articulator. While the Hinge articulator is indeed a type of articulator, it is not the correct answer in this case.
**Option B:** This option is incorrect because it is a characteristic of a semi-adjustable articulator, not an Arcon articulator.
**Option C:** This option is incorrect because it is a characteristic of a non-adjustable articulator, which is not the type of articulator being described in this question.

**Clinical Pearl / High-Yield Fact**
One key point to remember when working with articulators is that the type of articulator used can significantly impact the accuracy of the dental prosthesis. An Arcon articulator is typically used for patients with a high degree of condylar guidance, whereas a semi-adjustable articulator may be more suitable for patients with a more complex occlusal relationship.

**Correct Answer: C. The condylar assembly is attached to the lower part of the frame.**