The newspaper contains a report of a research team in Europe that has found a brain area in a group of schizophrenic patients that is smaller than the same area in normal individuals. The article was written by a well-known science writer who has a keen

keen understanding of schizophrenia. What is he likely to conclude?

a. Dietary factors account for most differences in brain size.
b. A complex disorder such as schizophrenia is not likely to be traced to a single brain site.
c. The differences are probably the result of differences in the size of the individuals that made up the respective groups.
d. Most such differences have been found to be the result of drug treatments for the disorder and not reflections of some underlying cause.

Answer: b.