input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Latest technique by which bone graft is obtained without damaging vital structure, vessels/veins is based on?   (A) Piezoelectric vibration   (B) Osteotome   (C) Ultrasonic/soft lasers   (D) Electrocautery
output: ['(A) Piezoelectric vibration <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Piezoelectric vibration  (B) Osteotome  (C) Ultrasonic/soft lasers  (D) Electrocautery <> possible answers', '  Latest technique by which bone graft is obtained without\ndamaging vital structure, vessels/veins is based on? <> context']