General of the United States shall complete a study on the effectiveness of this part in developing priority antimicrobial drugs. Such study shall examine the indications for, usage of, development of resistance with respect to, and private and societal value of critical need antimicrobial drugs, and the impact of the programs under this part on markets of critical need antimicrobial drugs. The Comptroller General shall report to the Committee on Health, Education, Labor, and Pensions of the Senate and the Committee on Energy and Commerce of the House of Representatives on the findings of such study. (b) Antibiotic use in the United States