Question

which is a thesis statement?
although jonas salk invented the polio vaccine, it is albert sabin, creator of a safer and cheaper version of the vaccine, who deserves the credit for curing polio in the u.s.
in order to confirm the effectiveness of the polio vaccine that he had invented, jonas salk administered it to a number of people, including his wife, their children, and even himself.

Explanation:

A thesis statement presents a clear, arguable claim that guides an essay. The first statement takes a position on who deserves credit for curing polio in the U.S., which is a debatable claim. The second statement only describes a factual action taken by Jonas Salk, with no arguable claim.

Answer:

Although Jonas Salk invented the polio vaccine, it is Albert Sabin, creator of a safer and cheaper version of the vaccine, who deserves the credit for curing polio in the U.S.