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.

Context: His doctoral thesis under the supervision of Charles Tart was on the phenomenology of deep states of hypnosis. He subsequently went on to do post-doctoral work in the area of dissociation and hypnosis at Stanford University under David Spiegel. Link Information: none Answer: none
Which doctorate and post doctorate supervisor's that Cardena worked under was older?

Context: The Vorem Holz 3 archeological site contains the remains of a Bronze Age settlement in the Pieterlen municipality. Link Information: none Answer: none
What was the duration of the Bronze Age?

Context: Shawn Michaels defending the title against the British Bulldog Link Information: none Answer: none

Of the two referees for the match between Shawn and Bulldog, who has worked in wrestling for the longest amount of time?