Question: The 2015 San Diego Padres season had a general manager of which former Texas Rangers assistant GM?
Sentence (from "2015 San Diego Padres season"): General Manager A. J. Preller had a busy offseason, acquiring a new starting outfield in Matt Kemp, Justin Upton, and Wil Myers, while adding to an already strong bullpen with All-Star closer Craig Kimbrel.
Relevant evidence: Yes