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].

[EX Q]: Goldman Sachs CEO Lloyd Blankfein  has bitcoin on  his  mind  a day after reports broke that  his  firm was considering setting up a bitcoin trading operation.
The billionaire banker tweeted on Tuesday that  he  wasn't completely sure about  his  stance on the red-hot cryptocurrency.
 Blankfein  said  he 's "still thinking about bitcoin" and that  he  was not flat out endorsing or denouncing the digital currency. Here's the full tweet:
Still thinking about #Bitcoin. No conclusion - not endorsing/rejecting. Know that folks also were skeptical when paper money displaced gold. â Lloyd Blankfein (@lloydblankfein) October 3  2017
[EX A]: Lloyd Blankfein

[EX Q]: CRAWFORD , Texas -LRB- AP -RRB- -- Military veterans injured during their service are participating in former President George W. Bush 's annual Warrior 100K bike ride at his Central Texas ranch . 
Three buses brought 52 soldiers Saturday to Bush 's Prairie Chapel Ranch in Crawford , about 20 miles -LRB- 32.19 kilometers -RRB- west of Waco , for the seventh annual 100-kilometer -LRB- 62.14-mile -RRB- ride on trails at the ranch .
[EX A]: George W Bush

[EX Q]: Here at Reviewed  we monitor the BEST deals you can get online all the time. So this year on Black Friday   we 've got a pretty good idea of the best ones you can get right now. You can see  our  list of the best deals here.
I bought this in ‘burgundy stem’ at full price a few months ago and I LOVE it. I wear it all the time. Madewell and other retailers are selling basically the same item for over $100—and now this sweater is only $25. It’s a steal!
4.  Madewell Jeans
Madewell Jeans (Photo: Madewell)
 Everything is 25% off on  Madewell  right now with the code DONTSTRESS. I swear by  Madewell jeans  and recommend  them  to anyone. When you can get  them  for 25% off  it’s a no-brainer! I own  these ripped jeans  and LOVE  them .
[EX A]:
Madewell