Dental The study of first choice for the assessment of an unknown or new disease when there is no etiological hypothesis is ___: A Cohort study. B Randomized clinical trials. C Ecological studies. D Descriptive studies. 💡 Explanation The study of first choice for the assessment of an unknown or new disease when there is no etiological hypothesis is ___: ✓ Correct Answer: D. Descriptive studies.