Anyone infected with the G virus will produce antibodies to fight the virus after three months. The antibodies will then increase for six months. There is now a test that reliably indicates how many antibodies are present in a person' s body. If positive, this test can be used during the first nine months of infection to estimate within a month how long that person has been infected. Which one of the following conclusions is best supported by the statements above? ['Antibodies are produced only for infections that cannot be defeated by medication.', 'People who remain infected with the G virus will eventually have no antibodies in their system.', 'The test will not be effective from six to nine months.', 'Anyone infected with the G virus will for a short time fail to exhibit infection if tested by the antibody test.']