The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Which of the following is not true for incubation period?   (A) For determining isolation period of a disease   (B) To prevent infection among contacts   (C) For quarantine of disease   (D) To differentiate among secondary cases and co-primary cases
['(A) For determining isolation period of a disease <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) For determining isolation period of a disease \n (B) To prevent infection among contacts \n (C) For quarantine of disease \n (D) To differentiate among secondary cases and co-primary cases <> possible answers', '  Which of the following is not true for incubation period? <> context@']