input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** After a point mutation, glutamic acid is replaced by valine, which leads to formation of sickle cell hemoglobin. The mobility of HbS as compared with normal hemoglobin on gel electrophoresis will be:   (A) Decreased   (B) Increased   (C) Dependent on HbS concentration   (D) Unchanged.
output: ['(A) Decreased <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Decreased  (B) Increased  (C) Dependent on HbS concentration  (D) Unchanged. <> possible answers', '  After a point mutation, glutamic acid is replaced by valine, which leads to formation of sickle cell hemoglobin. The mobility of HbS as compared with normal hemoglobin on gel electrophoresis will be: <> context']