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What is valvular regurgitation?
a. An abnormal leakage of blood forward due to the incomplete closing of a heart valve
b. An abnormal leakage of blood forward caused by the absence of a heart valve
c. An abnormal leakage of blood backward caused by the incomplete closing of a heart valve
d. Abnormal extravascular leakage caused by the incomplete closing of a heart valve
e. An abnormal leakage of blood backward caused by the absence of a heart valve



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