An advertisement for the drug, PLAVIX, states the following: " 'if you've been hospitalized for heart-related chest pain or a certain type of heart attack.' Doctors call these conditions ACS, or Acute Coronary Syndrome. You can do more to help protect yourself against a future heart attack or stroke - ask your doctor about adding PLAVIX. For most, heart attack or stroke is caused when platelets form clots that block the flow of blood to the heart or brain. Think aspiring and other heart medications alone are enough? Adding PLAVIX could help protect you against a future heart attack or stroke. PLAVIX, added to aspirin and your current treatment, helps raise your protection against a future heart attack or stroke. Prescription PLAVIX and your other medications work in different ways. Adding PLAVIX can go beyond your current treatment. PLAVIX, taken with aspirin, plays its own role in keeping platelets from sticking together and forming clots - which helps keep blood flowing. Talk to your doctor about PLAVIX."
In the PLAVIX advertisement, the claim that adding PLAVIX to aspirin helps raise a person's protection against future heart attack is a _____ unit, because it makes an assertion about the benefits of aspirin alone.
