Instructions: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Among the entities, try to find the best entity that is most likely to fill in "_" and classify the answers based on options.
Input: Federal prosecutors are reportedly preparing criminal corruption charges against New Jersey Democratic Senator Bob Menendez, the result of a grand jury probe that has lasted two years. Menendez, 61, has seen pressure from the Obama administration over his positions on Cuba and Iran. And he has long faced ethics questions about his relationship with Florida eye doctor Salomon Melgen, a wealthy and prolific donor. The senator's aides admitted in 2013 that he had intervened a year earlier with the acting chief of the Centers for Medicare and Medicaid Services on his friend's behalf, pushing back against accusations of overbilling the Medicare system by $8.9 million.New Jersey Sen. Bob Menendez could be charged in a matter of weeksAttorney general reportedly gave approval but insists 'I can't comment'Federal grand jury has been probing whether he traded political donations from eye doctor Salomon Melgen for improper government favorsMenendez spokeswoman says doctor has been 'one of his closest friends for decades' and insists everything he did was lawfulHHS accused Melgen of overbilling Medicare by $8.9 million and ordered him to pay it back; Menendez intervened about his caseSenator also paid Melgen back $58,500 for trips on the donor's private jet, calling his failure to reimburse him an 'oversight'Allegedly pressured US Customs to stop giving the Dominican Republic used cargo x-ray equipment so a company Melgen controlled would win a contract for new machinesHis aides refused to testify before a federal grand jury about conversations their boss had with HHS officials and a lawyer engaged to lobby for Melgen 
 Questions:Other news reports described an alleged scheme in which Melgen used leftover fluid from single-use injection vials to treat two or three additional patients, billing _ for a new vial with each treatment. (A) New Jersey (B) Democratic (C) Bob Menendez (D) Menendez (E) Obama (F) Cuba (G) Iran (H) Florida (I) Salomon Melgen (J) Centers for Medicare and Medicaid Services (K) HHS (L) Melgen (M) US Customs (N) Dominican Republic
Output:
(J)