Question

read the claim below.
the most important medical advance of all time was alexander flemings discovery of penicillin in 1928.
select the piece of evidence that best supports this claim.
penicillin, the first widely used antibiotic, has saved millions of lives around the world.
due to the overuse of penicillin and other antibiotics, some bacterial infections have become harder to treat.

Explanation:

The claim is that Fleming's discovery of penicillin is the most important medical advance. The first evidence states that penicillin (the discovery in question) is the first widely - used antibiotic and has saved millions of lives. This directly supports the idea that it is a highly important medical advance as it shows its positive impact (saving lives). The second evidence talks about the negative consequence (antibiotic resistance) due to overuse of penicillin and other antibiotics. This is a counter - point or a negative aspect related to penicillin's use, not a support for it being the most important medical advance.

Answer:

Penicillin, the first widely used antibiotic, has saved millions of lives around the world.