The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Phenol red thread test is used for dry eye:   (A) In the test, volume of tears is measured as it changes color on contact with tears   (B) If the color changes to blue, it depicts surface mucin deficiency   (C) Requires pH meter for reading the result   (D) Requires topical anesthetic agent
['(A) In the test, volume of tears is measured as it changes color on contact with tears <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) In the test, volume of tears is measured as it changes color on contact with tears \n (B) If the color changes to blue, it depicts surface mucin deficiency \n (C) Requires pH meter for reading the result \n (D) Requires topical anesthetic agent <> possible answers', '  Phenol red thread test is used for dry eye: <> context@']