Utilize the input text as a context reference, choose the right relationship between 'Boko Haram' and 'Abubakar Shekau' from the options.
Options: creator, chairperson, distribution format, legal form

Leader of the Boko Haram sect, Abubakar Shekau has again resurfaced in a recording and denied claims by Chadian … see more » Copyright © 2015 Vanguard.
chairperson