>>> What is the Texas Longhorn's head coach Steve Sarkisian's nickname? 

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The response "Sark" is indeed a nickname for Steve Sarkisian, the current head coach of the Texas Longhorns. This nickname is likely derived from his full name, Steve Sarkisian, which can be abbreviated or shortened to "Sark." It's a common practice to use nicknames in sports to make the names of coaches and players more manageable and easier to remember. Therefore, in the context provided, the answer is indeed "Sark."