ما هى اجابة هذا السؤال ؟ و ليه ؟

[ابو بيشو]

the reflexive form of the pronoun 'one' when it refers to people in general or to the person speaking:One has to learn to control oneself.
More examples
• When one looks at oneself in the mirror, it is hard to be uncritical.
• One has to look after oneself carefully in these circumstances.
• It is dangerous to see oneself as indispensable.