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': 'Clasp assemblies that accommodate functional prosthesis movement are designed to address the concern of: \nSelect and explain. \nA. Class I lever, B. Class II lever, C. Class III lever, D. Class IV lever', 'role': 'user'}, {'content': "Answer: A \nExplanation: Clasps Designed to Accommodate Functional Movement\nClasp\xa0 assemblies\xa0 that\xa0 accommodate\xa0 functional\xa0 prosthesis movement are designed to address the concern of a Class I lever.\xa0\nThe concern is that the distal extension acts as a long “effort\xa0 arm”\xa0 across\xa0 the\xa0 distal\xa0 rest\xa0 “fulcrum”\xa0 to\xa0 cause\xa0 the clasp tip “resistance arm” to engage the tooth undercut. This results in harmful tipping or torquing of the tooth, which is greater with stiff clasps and increased denture base movement.\xa0\nTwo strategies may be adopted to change the fulcrum location\xa0 and\xa0 subsequently\xa0 the\xa0 “resistance\xa0 arm”\xa0 engaging effect\xa0 (mesial\xa0 rest\xa0 concept\xa0 clasp\xa0 assemblies),\xa0 or\xa0 to\xa0 minimize the effect of the lever through the use of a flexible arm (wrought-wire retentive arm).\nKey Concept:\nClasp\xa0 assemblies\xa0 that\xa0 accommodate\xa0 functional\xa0 prosthesis movement are designed to address the concern of a Class I lever.\xa0\nRef: McCracken's REMOVABLE PARTIAL PROSTHODONTICS, THIRTEENTH EDITION page no 72", 'role': 'assistant'}]