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 a cast partial denture wearer, the stresses transferred to abutment teeth are decreased, if \nSelect and explain. \nA. Retentive arm of the clasp is less flexible, B. Edentulous span is Long, C. Length of the clasp is increased, D. Clasp is active when placed on abutment teeth', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]