All quarantined people have been in contact with Xiao Zhang, and all people who have been in contact with bird flu patients have been quarantined. If the above proposition is true, one of the following propositions is also true:. ['Xiao Zhang is a bird flu patient.', 'Some people have been exposed to both bird flu and Xiao Zhang.', 'All patients with bird flu have been in contact with Xiao Zhang.', 'Everyone who has contacted Xiao Zhang is isolated.']