The following are multiple choice questions (with answers) about medical knowledge.   **Question:** All are true about widal test except   (A) Base lines differ depending on the endemicity of the disease   (B) O antibodies last longer and hence is not indicative of recent infection   (C) H antigen cannot differentiate between subtypes   (D) High titre value in a single widal test is not confirmative
['(B) O antibodies last longer and hence is not indicative of recent infection <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Base lines differ depending on the endemicity of the disease \n (B) O antibodies last longer and hence is not indicative of recent infection \n (C) H antigen cannot differentiate between subtypes \n (D) High titre value in a single widal test is not confirmative <> possible answers', '  All are true about widal test except <> context@']