Questions: This plan requires periodontal probes to be above 5 mm pockets on each billable tooth with supporting xrays showing clinical loss of periodontal attachment, evidence of crestal bone loss or changes in crestal lamina dura, and root surface calculus. A. Guardian B. Aetna C. Delta D. I don't know the different guidelines and need training.

The answer is D: I don't know the different guidelines and need training.

Explanation:

• A. Guardian: This option suggests that the plan described is specific to Guardian, but without specific knowledge of Guardian's guidelines, this cannot be confirmed.
• B. Aetna: Similarly, this option suggests the plan is specific to Aetna, but without specific knowledge of Aetna's guidelines, this cannot be confirmed.
• C. Delta: This option suggests the plan is specific to Delta, but without specific knowledge of Delta's guidelines, this cannot be confirmed.
• D. I don't know the different guidelines and need training: This option acknowledges a lack of specific knowledge about the guidelines of different insurance providers, which is the most accurate response given the information provided.

Summary: The correct response is D, as it accurately reflects the need for further training to understand the specific guidelines of different insurance providers.