In 2015, the medical records of 1,200 pre-menopausal women who had been admitted to two Detroit hospitals between 1990 and 2000 for any gynecologic procedure were used to assemble a study group to determine whether early hysterectomy (exposure) was associated with reduced breast cancer risk compared with women who had not had an early hysterectomy (no exposure). Medical records from 1990 to 2014 were collected and reviewed to identify any new case of breast cancer during this period. The study findings suggested that the risk of developing breast cancer was lower among women who had undergone a hysterectomy compared with the risk of breast cancer among women who had not had an early hysterectomy. What type of study is described here?

• A.Retrospective Cohort Study
• B.Case-Control Study
• C.Prospective Cohort Study
• D.Cross-Sectional Study