The following are multiple choice questions (with answers) about medical knowledge.   **Question:** All these are Included In active tissue engineering, except   (A) Antigens fibroblasts   (B) Bilayered cell therapy   (C) Enamel matrix derivative   (D) Acellular dermal matrix
['(D) Acellular dermal matrix <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Antigens fibroblasts \n (B) Bilayered cell therapy \n (C) Enamel matrix derivative \n (D) Acellular dermal matrix <> possible answers', '  All these are Included In active tissue engineering, except <> context@']