When asked to explain how "review of systems" differs from "physical exam," you explain that

the review of systems is used to document
A. objective symptoms observed by the physician.
B. past and current activities, such as smoking and drinking habits.
C. a chronological description of patient's present condition from time of onset to present.
D. subjective symptoms that the patient may have forgotten to mention or that may have seemed
unimportant.

D "Objective symptoms observed by the physician" refers to the physical exam. "Past and
current activities, such as smoking and drinking habits" refers to the social history. "A
chronological description of patient's present condition from time of onset to present" refers
to the history of present illness.