What type of research study is MOST associated with recall bias?

Correct answer: D. Case-control study

• A. RCTs are prospective with randomization — they minimize recall bias through controlled data collection.
• B. Cohort studies are prospective (follow people over time) — recall bias is less of an issue since data is collected before outcomes occur.
• C. Cross-sectional studies measure prevalence at one point in time — while bias exists, recall bias is most classically associated with case-control studies.
• D. Correct. Case-control studies are RETROSPECTIVE — participants are asked to recall past exposures after an outcome has already occurred. People with disease (cases) may remember past exposures differently than controls without disease. This differential recall is the classic RECALL BIAS associated with case-control studies.