instruction:
In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
question:
A head teacher ( also called a school principal , or headmaster / headmistress ) is the teacher in charge of a school .
answer:
A head teacher , headmaster , headmistress , head , chancellor , principal or school director ( sometimes another title is used ) is the staff member of a school with the greatest responsibility for the management of the school .


question:
This Convention also have the " Optional Protocol to the Convention on the Elimination of All Forms of Discrimination against Women " .
answer:
The Optional Protocol to the Convention on the Elimination of All Forms of Discrimination against Women is a side-agreement to the Convention which allows its parties to recognise the competence of the Committee on the Elimination of Discrimination Against Women to consider complaints from individuals .


question:
International Ski Federation ( FIS ) is the sport organization for skiing .
answer:

The Fe ́ de ́ ration Internationale de Ski ( FIS ; English : International Ski Federation ) is the world 's highest governing body for international winter sports .


