Researchers at the National Cancer Institute queried men and women aged 50 and older about their diets, then followed participants for five years to record all diagnoses of head and neck cancer, which is the sixth-leading cause of cancer-related death worldwide. This is an example of

Question

Quizplus · Accepted Answer

The study involved following participants over a period of five years, which suggests a prospective design. The study also involved a cohort of individuals aged 50 and older, which further supports choice B as the best answer. The study was observing the relationship between diet and head and neck cancer, which makes it an observational study.

Researchers at the National Cancer Institute Queried Men and Women