This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Case Control Study, Combined Designs, Subject name: Social & Preventive Medicine
[{'content': 'If we do another study for 10-20 years in forward direction after retrospective coho study, it now is known as:- \nSelect and explain. \nA. Mixed Coho study, B. Retrospective coho study, C. Nested case control study, D. Mixed case control study', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Mixed Coho Studies Combination of Retrospective Coho study + Prospective coho study The coho is identified from past records and is assessed till date for the outcome. (Retrospective coho) The same coho is followed up prospectively into future for fuher assessment of outcome. (Prospective coho)', 'role': 'assistant'}]