instruction:
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.
question:
Context: y headed by the Saltigue (the Serer priestly class) Link Information: none Answer: none
answer:
How many leaders run the priestly class?


question:
Context: He attended the Higher Command and Staff Course, graduating in April 1991 Link Information: The Higher Command and Staff Course is a staff course for senior military officers of the United Kingdom armed forces and allies. Answer: United Kingdom 
answer:
In which country did Trousdell attend school as an officer?


question:
Context: The JMSDF's special forces unit, the Special Boarding Unit Link Information: none Answer: none
answer:

Who heads the special forces unit of the JMSDF?