This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
A total of 5000 patients of glaucoma are identified and surveyed, including interviews regarding family history of glaucoma. Such a study design is called 
Select and explain. 
A. Case series repo, B. Case control study, C. Clinical trail, D. Coho study
A: Case series repo
Answer: A: Case series repo 
Explanation: A case series (also known as a clinical series) is a type of descriptive study that tracks subjects with a known exposure, such as patients who have received similar treatment or examines their medical records for exposure and outcome.