UKMLA PLAB AMC USMLE Prometric MCQ

Question Number 0035
Question:
Controversy surrounds the surgical treatment of Ebstein's anomaly. An author studies a population group undergoing surgery in early adulthood. He compares the results with those of a study performed twenty years previously in which surgery was performed in infancy.
This study is likely to result in

a) recall bias
b) chronologic Bias
c) lead-time bias
d) publication bias
e) selection bias