Refer to the input text as context and select the correct relationship between 'Boko Haram' and 'Abubakar Shekau' from the available options.
Options: legal form, chairperson, distribution format, creator

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