Doctors across the country are demanding that the Trump administration explain how it is distributing the sole drug proven to help coronavirus patients to hospitals. Physicians and infectious-disease experts say that the government has so far ignored some medical centers that are treating large numbers of coronavirus patients. The drug’s maker, Gilead, has donated an unspecified number of doses to the government, which has put HHS and FEMA in charge of doling out the drug to hospitals. So far the rollout has been chaotic. About 25 hospitals have been approved to receive the drug, but doctors say it’s not clear how the government — through its contractor, AmerisourceBergen — is making those decisions. A spokesperson for the company said the administration is choosing which facilities receive the drug and how much they get.