Question: How many of the Fortune Global 100 companies are clients of the management consulting firm that William D. Green retired from in 2013?
Sentence (from "Boston Consulting Group"): The firm advises clients in the private, public, and not-for-profit sectors around the world, including more than two-thirds of the Fortune 500 and is one of the 'Big Three' strategy consulting firms (MBB).
Relevant evidence: No