let questions = [
{ question: "Grand Central Terminal, Park Avenue, New York is the world's?", a: "largest railway station", b: "highest railway station", c:"longest railway statiom", d:"None of the above", answer: "a" },
{ question: "Ttt is the science that studies?", a: "Behavior of human beings", b: "Insects", c:"The origin and history of technical and scientific terms", d:"The formation of rocks", answer: "b" }
];
I'm creating a quiz app. It's my questions array. But if the users look to the source, they see answer of all questions. 
How can i fix that? How to hide datas in the array. İf you help me i will be glad.