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].

If your mum posted a video of you belting out Madonna's "Holiday" in the car on your birthday  you'd probably want to melt into a puddle of embarrassment.
Unless your mum happens to be Madonna.
Celebrating the birthday of her son  David Banda   Madonna  posted an Instagram video to  her  10.2 million followers on Sunday. The video features David having a delightful singalong worthy of Carpool Karaoke  to his own mum's 1983 hit single  "Holiday."
Go David!! ððð¦.Its your birthday!!! ðððððð We Gonna Party! â½ï¸â¥ï¸â½ï¸â¥ï¸â½ï¸ðâ½ï¸ Like its your birthday!! ððð¦ðð¦ðððððððð!! Its Time to Celebrate! ððð¤¡ pic.twitter.com/W1WcENjb0R â Madonna (@Madonna) September 24  2017
 Madonna  adopted David from Malawi in 2006. Here's another Instagram post from pop's proud  proud mum  posted on Sunday and featuring a mini David:
Happy Birthday to My Beautiful baby Boy!! ðððððððððð David Banda!! ð¦ð¦ð¦ððððð I wish I could stilll carry you Bapu Style! â¥ï¸ð¯â¥ï¸ð¯â¥ï¸ð¯â¥ï¸ð¹ð²ð¼ð²ð¼ð²ð¼â¥ï¸ðð» A post shared by  Madonna  (@madonna) on Sep 24  2017 at 3:10am PDT
Madonna

Federal Reserve Chairman Ben Bernanke signaled Thursday that sales of the central bank's holdings in mortgage-backed securities may play a more prominent role in the withdrawal of monetary stimulus than he indicated last month.
 "I anticipate that at some point we will in fact have a gradual sales process " Bernanke said Thursday in testimony to the House Financial Services Committee. In prepared remarks  he avoided repeating a February statement that the Fed won't sell any securities "at least until after policy tightening has gotten under way." Instead  he said Thursday the tool is one way of "applying monetary restraint."
 "We would like to get back to an all-Treasury portfolio within a reasonable amount of time " Bernanke said in response to a question from Rep. Jeb Hensarling  R-Texas. The balance sheet should eventually be reduced to less than $1 trillion  Bernanke told Rep. Ron Paul  R-Texas  who advocates abolishing the Fed.
 Raising the interest rate paid on funds deposited by banks at the Fed  as well as so-called reverse repurchase agreements that temporarily drain cash from the banking system  will still be among the main tools for tightening credit  Bernanke said.
 "The FOMC is not comfortable with holding all of these securities until they mature  as some would be 30 years  and we want to move more quickly than that back to the pre-crisis balance sheet " Bernanke said. The Fed wouldn't sell assets in a "really weak economy " he said.
 At the same time  Bernanke didn't say when the Fed would begin executing its strategy. He said the U.S. economy still needs low interest rates and that the central bank will be ready to tighten credit "at the appropriate time."
 "The economy continues to require the support of accommodative monetary policies " Bernanke said in prepared testimony  repeating parts of a statement to the panel from last month.
 Thursday's hearing  originally scheduled for Feb. 10  was postponed because of a snowstorm. The Fed went ahead and released Bernanke's prepared testimony that day  in part to lay the groundwork for a planned increase in the interest rate the central bank charges for direct loans to banks.
 Responding to questions  Bernanke said the "unemployment situation is very weak " and the housing market is "still quite weak."
Ben Bernanke

MILWAUKEE (AP) —  Emery Lehman  won the 5 000 meters at the U.S. speedskating trials. Except  he  didn't earn an Olympic berth. Not yet anyway.
The U.S. doesn't have a spot in the 5 000 next month in Pyeongchang  South Korea  so  Lehman  will try to make the team in a different event.
The Americans have second priority and third reserve for the 5 000. They won't find out until later this month whether a spot opens up for someone  not necessarily  Lehman   to skate at the Olympics. That could happen if other countries decide not to enter their skaters.
However   Lehman  still needs to make the team in another event in order to skate the 5 000 if the U.S. earns a spot. Otherwise  the U.S. would choose a skater already in Pyeongchang to compete.
 Lehman  is skating on home ice this week.  He  trains and coaches skaters ranging from first grade to junior high at the Pettit National Ice Center and attends nearby Marquette University  where  he 's taking a break from  his  civil engineering studies.
"They say you don't really know something until you can explain it or try and make other people understand it "  he  said. "That really relates to speedskating. I have to explain it to these really little kids who may not understand it fully. Half the time I probably don't fully understand what I'm saying until I try to explain it 100 times and finally it clicks in my head."

Emery Lehman