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 zero degree anatomic teeth is used in: \nSelect and explain. \nA. Sharp ridge, B. Flat ridge, C. Ridge with undercut, D. Well contoured ridge', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Monoplane Occlusion\n\nCuspless teeth (0o) on a flat plane with 1.5-2.0 mm overjet.\nNo cusp to fossa relationship\nNo anterior contacts in centric position\nPoor residual ridges\nPoor neuromuscular control (Bruxers, CP, etc.,)\nPreviously successful with monoplane dentures or severely worn occlusion on the previous denture\nArch discrepancies\n\t- Class II or III or Cross-bite\nImmediate Dentures\n\t- Except when opposing natural dentition\nPotential poor follow-up.', 'role': 'assistant'}]