Question #0006

Cardiologist: Having high blood pressure can make one
more likely to suffer a heart attack. One factor that may
reduce blood pressure is owning a pet. A careful study
recently conducted on patients at this hospital revealed
that nearly ninety percent of those who bought a pet after
their first cardiac episode showed a decrease in their
blood pressure within three months. However, some
skeptics have argued that these patients changed their
diets and exercise habits at the same time, and these
other lifestyle changes, rather than owning a pet, caused
the reduction in blood pressure.

If the cardiologist’s claims are true, which one of the
following must also be true?

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