List the four routes through which germs can enter the body

Which design best describes this epidemiologic study?

An epidemiologist was interested in determining whether use of non-steroidal anti-inflammatory drugs (NSAIDS) causes gastrointestinal bleeding. S/he recruited 600 subjects who had been hospitalized with gastrointestinal bleeding and 600 subjects from the local community who had never been diagnosed with such a bleeding problem. Due to concern over their diagnosis, subjects who had experienced a gastrointestinal bleed were able to provide a more accurate recollection of their NSAID use, while the comparison subjects were more likely to underestimate their use a. quasi-experimental study b. cohort study c. cross-sectional study d. case-control study

Interpret the physicians' medication orders. Theophylline 160 mg po q6h

What will be an ideal response?