Given a document, find the main entity about whom the author is writing. Write the full name if mentioned in the text. Note that URLs in the text have been replaced with [Link].
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Question: SACRAMENTO  Calif. (Reuters) -  A California neuroscientist vying to unseat Republican Congressman Dana Rohrabacher  stepped up  his  criticism of the conservative on Tuesday  demanding  he  return a $1 000 contribution from indicted Trump adviser Paul Manafort.
FILE PHOTO:  Republican U.S. Representative Dana Rohrabacher  speaks at a news conference in Moscow  Russia on June 2  2013. REUTERS/Maxim Shemetov/File Photo
The Orange County seat held by  Rohrabacher  is key to Democratsâ hopes to increase their numbers in the U.S. House of Representatives in next yearâs elections. Neuroscientist Hans Keirstead  a stem cell researcher and entrepreneur from Laguna Beach  is one of seven Democrats aiming to beat him  according to the Federal Election Commission.
 Rohrabacher   a senior member of the House Committee on Foreign Affairs  has frequently praised Russian President Vladimir Putin and was considered for a role in U.S. President Donald Trumpâs cabinet.
FILE PHOTO: U.S. Rep. Dana Rohrabacher (R-CA) speaks during a House Foreign Affairs Europe  Eurasia and Emerging Threats Subcommittee hearing about the attack on demonstrators by members of Turkish President Recep Tayyip Erdogan's security detail on Capitol Hill in Washington  DC  U.S. on May 25  2017. REUTERS/Aaron P. Bernstein/File Photo

Answer: Dana Rohrabacher


Question: Fannie and Freddie buy mortgages and package them into securities with a guarantee against default.
 Fannie and Freddie have a legal right to return bad loans  especially if they later discover fraudulent statements on applications. Any money they recover offsets their losses.
 A bigger headache for lawmakers is figuring out what to do with Fannie and Freddie in the future.
 The Obama administration is working on a plan to restructure the mortgage market and make sure home loans are affordable. Officials don't plan to release details until next year. But Michael Barr  an assistant Treasury secretary  told the panel Wednesday that Fannie and Freddie "will not exist in the same form as they did in the past."
 Republicans have seized on the administration's management of Fannie and Freddie to illustrate Democrats' push for broadening the reach of the federal government. They say loans acquired by Fannie and Freddie since the September 2008 takeover have put taxpayers at risk.
 But Democrats and regulators say the loans acquired by Fannie and Freddie before their takeover represent the overwhelming majority of the companies' losses. New loans acquired since then have been performing well  they note.
 "There is no urgency " to reform the two companies  said Rep. Barney Frank  the committee's chairman. "The pattern of abuse they had engaged in has been changed...Fannie and Freddie are behaving differently and are causing far less problems."

Answer: Freddie Freddie


Question: In 2015  Dr. Dong Chang  the director of the medical intensive care unit at Harbor-UCLA Medical Center  a public hospital in Los Angeles  decided to see whether the care being delivered in his ICU was appropriate.
 Chang  and  his  team also reviewed the use of intensive care at 94 hospitals in two states  Maryland and Washington  focusing on four common conditions that can lead to treatment in an intensive care unit.
 Chang  attributes the difference to doctors using intensive care based on their habits  hunches or training. Profit  he said  may also be a motive  but it didn't appear to be a driving force.
"We really don't have good standards and a good discussion going on about who should receive ICU care  " Chang  said.
The unnecessary intensive care can also be harmful. The study found intensive care patients underwent more invasive procedures  like the insertion of catheters  including central lines  which carry the risk of infection. Overuse of the ICU is bad for patients who don't need it   Chang  said. Survival rates were also no better at the hospitals that used intensive care the most.
Reducing unneeded intensive care stays would save big money. Intensive care costs about $10 000 for a typical stay and accounts for 4 percent of national health care expenditures  according to research cited by  Chang 's team.
 Chang  hesitated to call the overuse of intensive care "wasted" health care spending.  He  said the medical literature calls it "non-beneficial" care  which is maybe a nicer way of saying the same thing.
For O'Neill   her  dispute of the fee for  her  daughter's ear piercing was a trip into the hell of medical billing.
O'Neill is an attorney  so  she  knows how to weed through fine print. But it took  her  untold hours and phone calls to the hospital and  her  insurance company to root out the issue. The hospital had initially billed  her  insurer for the $1 877.86 for "operating room services" related to the ear piercing. The company rightly rejected payment for the cosmetic procedure. So  the hospital billed the family  according to  her  medical and billing records and correspondence.
O'Neill said  she  got nowhere in several conversations with the manager of the hospital's team that deals with payments directly from consumers. Then in mid-July  O'Neill wrote a letter to the manager explaining that they were at an impasse and urged the hospital to cancel the bill.

Answer:
Dong Chang