Task: Explanation
Input (English): Hadiza Bala Usman (born January 2, 1976) is a Nigerian activist and politician. She is currently the Managing Director of the Nigerian Ports Authority (NPA) as appointed by President Muhammadu Buhari on Monday 11 July 2016. She was formerly the Chief of Staff for the Kaduna State Governor. Bala Usman is an active member of the All Progressives Congress (APC). Question: What Nigerian president appointed the Managing Director of the NPA in 2016? Answer: Muhammadu Buhari
Output (English):  She is currently the Managing Director of the Nigerian Ports Authority NPA as appointed by President Muhammadu Buhari on Monday 11 July 2016.