question: Q:A recent study attempted to analyze whether increased "patient satisfaction" driven healthcare resulted in increased hospitalization. In this hospital, several of the wards adopted new aspects of "patient satisfaction" driven healthcare, whereas the remainder of the hospital continued to use existing protocols. Baseline population characteristics and demographics were collected at the start of the study. At the end of the following year, hospital use was assessed and compared between the two groups. Which of the following best describes this type of study?? 
  {'A': 'Retrospective cohort', 'B': 'Prospective cohort', 'C': 'Retrospective case-control', 'D': 'Prospective case-control', 'E': 'Cross-sectional study'},