Step 1: Understanding the Concept:
The question asks about the professional training background of a counsellor. Counselling is a professional activity that helps individuals, couples, or groups address emotional, social, and personal challenges.
Step 2: Detailed Explanation:
(D) Psychologist: The field of counselling psychology is a specialty within professional psychology. Counsellors are trained in psychological theories, therapeutic techniques, ethics, and human development. Therefore, a professional counsellor is a trained psychologist or has training rooted in psychology.
(A) Doctor: This usually refers to a medical doctor (M.D.). A psychiatrist is a medical doctor specializing in mental health, but not all counsellors are psychiatrists. The general term "counsellor" does not imply a medical degree.
(B) Teacher: While a counsellor may educate clients, their primary training and role are therapeutic, not pedagogical in the academic sense.
(C) Guardian: A guardian is a legal role. While a counsellor provides support, they are not a legal guardian.
Step 3: Final Answer:
The most accurate description of a counsellor's professional training and field is that of a psychologist.