The following are multiple choice questions (with answers) about medical knowledge.   **Question:** All of the following statements about cast cobalt alloys are true EXCEPT:   (A) They have a modulus of elasticity twice that of gold alloys.   (B) They are more rigid than gold alloys.   (C) They have higher ductility than gold alloys.   (D) They have a lower proportional limit than gold alloys.
['(C) They have higher ductility than gold alloys. <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) They have a modulus of elasticity twice that of gold alloys. \n (B) They are more rigid than gold alloys. \n (C) They have higher ductility than gold alloys. \n (D) They have a lower proportional limit than gold alloys. <> possible answers', '  All of the following statements about cast cobalt\nalloys are true EXCEPT: <> context@']