Social & Preventive Medicine Group of smokers followed up for 10 years to find incidence of cancer lung. What type of study is this? A Retrospective cohort B Prospective cohort C Case control study D Randomized control trials 💡 Explanation Group of smokers followed up for 10 years to find incidence of cancer lung. What type of study is this? ✓ Correct Answer: B. Prospective cohort