This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
[{'content': 'In designing a retainer on a noncarious mandibular first premolar abutment with short clinical crown which of the following restorations is most appropriate? \nSelect and explain. \nA. A full crown, B. A reverse 3/4 crown, C. MOD onlay, D. Inlay', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]