The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Etchant preferred in gel form than in liquid form:   (A) Better control over placement   (B) Enhance and concentrate the action of acid   (C) Helps in visualization while placement   (D) None of the above
['(A) Better control over placement <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Better control over placement \n (B) Enhance and concentrate the action of acid \n (C) Helps in visualization while placement \n (D) None of the above <> possible answers', '  Etchant preferred in gel form than in liquid form: <> context@']