Researchers Wanted to Provide Additional Support for a Causal Association

Multiple Choice

Researchers wanted to provide additional support for a causal association between human papillomavirus (HPV) and oropharyngeal cancers.They performed an epidemiologic study of 100 patients with newly diagnosed oropharyngeal cancer and 200 control patients without cancer to evaluate associations between HPV infection and oropharyngeal cancer.[D'souza G,Kreimer AR,Viscidi R,et al.A study of human papillomavirus and oropharyngeal cancer.N Engl J Med.2007;356(19) :1944-1956.] What kind of study design is this?

A) Retrospective cohort study
B) Prospective cohort study
C) Case-control study
D) Randomized trial
E) Case report