In this task, you're given a context, further information available on a particular linked term from the statement, and an answer term. Your job is to generate a question that can use the information provided to obtain the given answer. You should use the information on both context and link information to create the question. Note that the answer to the question should be exactly the given answer, and if the answer is none, the answer to the question shouldn't be obtainable from the context or linked information.
Q: Context: the Oilers joined the NHL in 1979 Link Information: They returned to their current name in the following year, and subsequently joined the NHL in 1979 as one of four franchises absorbed through the NHL merger with the WHA. Answer: Glen Sather
A:
Who was the head coach for the Edmonton Oilers when the team joined the NHL?