**Core Concept:** The Delphi method is a structured communication technique used in research and decision-making processes to reach consensus among a group of experts. It involves multiple rounds of surveys, where participants provide their opinions, and the results are summarized back to them in each round to guide revisions and refinements.

**Why the Correct Answer is Right:** The Delphi method is a consensus-building technique that aims to gather opinions from a group of experts. In this case, the correct answer, option D, refers to the Delphi method being a "group process facilitating group decision making." This statement accurately captures the essence of the Delphi method, emphasizing its purpose in facilitating group decision-making through iterative feedback sessions among a group of experts.

**Why Each Wrong Option is Incorrect:**

A. Not true: "Delphi method is a random sampling technique." The Delphi method is not about random sampling of participants but a structured decision-making process involving a group of experts.

B. Not true: "Delphi method is a statistical technique." The Delphi method is a group process, not a statistical technique. It aims to reach consensus among experts rather than analyze data statistically.

C. Partially true: "Delphi method is a qualitative research method." While the Delphi method can be used in qualitative research, it is not limited to this type of research design. It can also be applied in quantitative research, decision-making, and forecasting.

**Clinical Pearl:** Understanding the correct application of the Delphi method helps researchers, educators, and practitioners engage in informed decision-making processes involving expert opinions. It highlights the importance of involving a diverse group of experts and facilitating iterative feedback to reach consensus or informed decisions.