Because Cohort Research Is Extremely Difficult and Time-Consuming, Another Approach

Multiple Choice

Because cohort research is extremely difficult and time-consuming, another approach is to take an intact cohort from the past and collect data from their educational, family, police, and hospital records. This research format is known as a/an:

A) reverse cohort study.
B) transplant study.
C) exposition cohort study.
D) retrospective cohort study.