Dental In a UK study, it was found that there were more deaths from asthma than the sale of anti-asthma drugs. This is an example of: A Cohort study. B Case reference study. C Ecological study. D Experimental study. 💡 Explanation In a UK study, it was found that there were more deaths from asthma than the sale of anti-asthma drugs. This is an example of: ✓ Correct Answer: C. Ecological study.