Influenza is usually transmitted from an infected person to someone who works near him. Therefore, medicines that suppress the symptoms of flu actually increase the number of people infected with the flu, because this medicine that suppresses flu makes people who should be in bed at home Return to the workplace when infected. If the above statement is correct, which of the following most strongly refutes this inference? ? ['This flu-suppressing drug can suppress the main mode of transmission of flu-cough.', 'Some medicines commonly used to suppress the flu are also often used to treat patients who are not infected with the flu.', 'Many workers who are infected with the flu should stay at home because the symptoms of the flu reduce their work efficiency.', 'In order to avoid spreading the flu to people who have retired home over the age of 65, most adults have adopted preventive measures to prevent the flu.']