The correct answer is True.
You can still get the flu, but the flu shot significantly reduces the odds that you'll get it, and can lessen the severity of its symptoms if you do get it.
Influenza viruses are simple organisms capable of rapid genetic mutations. That's why getting the flu vaccine is a yearly affair. Each year, a new formulation of the flu vaccine is made to account for new mutations of the influenza virus.
Despite a rigorous effort to develop the yearly vaccine, there's no guarantee that the vaccine will match the strains of influenza that end up circulating throughout the world's population. However, the match is good about 90 percent of the time.
