Which of the following best describes a case-control study? X O Subjects are part of exposure or non-exposure groups, but not assigned by the investigators to these groups, followed forward in time and outcomes are measured. a single patient with a remarkable condition is discussed in detail. O Subjects are randomly assigned to control and treatment groups, followed forward in time and outcomes are measured. Subjects with a condition of interest are matched against similar subjects without the condition, and their history is examined to look for an exposure of interest