A case-control study was done of whether consuming jelly beans is a risk factor for the development type 2 diabetes. He works in a community hospital and doesn't have a large research budget, so he decides to do the study as inexpensively as possible. He identifies all of the currently hospitalized patients with type 2 diabetes and invites them to be cases in his study. He then selects a random sample of nurses and doctors in the hospital and invites them to be controls in his study. Which of the following biases is most likely, given the choice of a control population (choose the one best answer)?

Diagnostic suspicion bias

Hawthorne effect

Family information bias

Selection bias