Which professional is an expert in psychology?

• A. An expert in psychology
• B. A medical doctor
• C. A nurse
• D. A social worker

Answer: (A)

Understanding who is specialized in psychology helps here: psychology is the study of behavior and mental processes, so the expert is someone trained specifically in that field—a psychologist. The option that states “an expert in psychology” directly identifies this specialization, making it the best choice. The other professionals—medical doctor, nurse, and social worker—may work with psychology or mental health but are not defined by expertise in psychology itself, so they aren’t the correct answer in this context.