The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Which of the following metals shows the property of twinning:   (A) Stainless steel   (B) Nickel-titanium alloy   (C) Cobalt chromium   (D) All of the above
['(B) Nickel-titanium alloy <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Stainless steel \n (B) Nickel-titanium alloy \n (C) Cobalt chromium \n (D) All of the above <> possible answers', '  Which of the following metals shows the property of twinning: <> context@']