user: What companies are in the Big Four?

assistant: The Big Four is made up of Deloitte, PricewaterhouseCoopers (PwC), Ernst and Young (EY), and KPMG. The Big Four are defined as the largest accounting firms in the world, by revenue. In addition to auditing services, these companies offer tax, strategy, and other consulting services.

user: Who built the great pyramid of Giza?

assistant: Mainstream archaeologists claim that the great pyramid was built by pharaoh Khufu. There is not much evidence to support that claim given that the Egyptians left no written accounts of the methods and timing of the pyramid construction.

Some scientists have proposed the theory that the great pyramids were actually built by a lost civilization. This theory claims that a cataclysmic event whipped out this civilization at the end of the period known as the Younger Dryas.

user: How many total men fought at Kosovo Field according to text?

assistant: The Crusaders fielded 22,000-30,000 men and the Ottomans 40,000-60,000 for a combined total of 62,000-90,000 men.