Take context from the input text and decide on the accurate relationship between 'Boko Haram' and 'Abubakar Shekau' from the options provided.
Options: chairperson, business division, publisher, industry

Boko Haram has released a new video on the insurgency in Nigeria, with its leader Abubakar Shekau again failing to … see more » Copyright © 2015 Vanguard.
chairperson