At the insistence of family members, you take your elderly grandfather to a general practice physician, who refers him to a neurologist. When you ask for a description of neurologists, the general practitioner tells you they are

a. psychologists specializing in neuroses.
b. psychiatrists specializing in nervous disorders.
c. psychologists specializing in neuropsychological testing.
d. physicians specializing in diseases of the brain and nervous system.

Answer: d.