During the Utilization Review Committee meeting, a case presented for discussion involved a surgical case resulting in unexpected loss of lower extremity below the knee due to complications requiring extended length of stay. Being a sentinel event, the committee requested that an investigation and reporting was required to identify the cause and prevention of future occurrences. This *investigation* and required reporting to the Joint Commission is known as a
A. root cause analysis.
B. report card.
C. medication review.
D. potential compensable event.