**Core Concept**
The Dental Aesthetic Index (DAI) is a method used to evaluate the aesthetic quality of the dentition. It quantifies the impact of dental anomalies on the overall aesthetic appearance of the smile. The DAI assesses factors such as the alignment, spacing, and shape of the teeth.

**Why the Correct Answer is Right**
The DAI was developed by T. M. Kohn and S. C. M. Kieser in 1988. The index is a standardized tool for evaluating the aesthetic quality of the dentition, taking into account the subjective experience of the patient. The DAI scores are based on the alignment, spacing, and shape of the teeth, which are evaluated using a combination of photographs and clinical examination.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the DAI was not developed by this person.
**Option B:** This option is incorrect because the DAI was not developed by this person or organization.
**Option C:** This option is incorrect because the DAI was not developed by this person.

**Clinical Pearl / High-Yield Fact**
The DAI is a widely used and respected index in orthodontics, allowing clinicians to communicate effectively with patients about their aesthetic concerns and develop personalized treatment plans.

**Correct Answer: C. Kohn and Kieser**