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': 'The main drawback of a saddle pontic is: \nSelect and explain. \nA. It is unhygienic, B. It is unaesthetic, C. It is bulky, D. It does not restore the tooth contours', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]