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': 'Which among the following is least hygienic pontic: \nSelect and explain. \nA. Saddle pontic., B. Modified ridge lap pontic., C. Spheroidal pontic., D. Fish-belly pontic.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Saddle pontic \n• The concave gingival surface overlaps the ridge buccally and lingually.\n• The gingival surface will not have continuous contact with the ridge instead only the buccal and lingual ends of gingival surface will contact the tissue.\n• It is the least hygienic pontic', 'role': 'assistant'}]