The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Polishing of composite is problematic due to   (A) Soft matrix and hard filler particles   (B) Hard filler particles   (C) Hardness of matrix and filler particles   (D) None of the above
['(A) Soft matrix and hard filler particles <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Soft matrix and hard filler particles \n (B) Hard filler particles \n (C) Hardness of matrix and filler particles \n (D) None of the above <> possible answers', '  Polishing of composite is problematic due to <> context@']