True, they have collected data from people with and without the flu virus
The 1973 HMO or Health Maintenance Organization is a United States federal act that passed or endorsed during December 1973. It responded to the concerns of the rapid increase of federal health insurance expenditures and concerns about the wellness and care to those people who are 65 years old and above, younger people with disabilities and undergo dialysis or transplant. The 1973 HMO act gives a trial program that encourages and promote the improvement and development of HMOs. It also granted loans to expand the HMO, removed certain limitations for qualified HMO. Lastly, the act reinforced the term HMO and its greater access to the employer-based market.
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According to me, the answer is B participating in regular exercise
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