Mothers who experienced difficult deliveries of their babies were more likely to recall negative experiences with their hospital care.

Mothers who experienced difficult deliveries of their babies were more likely to recall negative experiences with their hospital care. Mothers who experienced no to minimal difficulties with the delivery of their baby could not think of any negative experiences with their hospital care. This is an example of:

A. A disadvantage of using the population as a control

B. Approach used by epidemiologists to identify controls

C. The placebo effect

D. Intent-to-treat