How to put images in questions of a quiz , where did the database through String [ ] ?

Hi , I'm doing a quiz game in which an image appears and the person guesses what it is, but I made the database of questions by String, but do not know how I can put the image in question . If anyone can help me , my email is yuri.souza@sga.pucminas.br .

SCRIPT QUESTIONS:

private int idTema;

 public Text TextPerguntas;
 public Text RespostaA;
 public Text RespostaB;
 public Text RespostaC;
 public Text RespostaD;
 public Text infoRespostas;



 public string[] perguntas;      //Armazena todos os pokemons
 public string[] alternativaA; //Armazena alternativas A
 public string[] alternativaB; //Armazena alternativas B
 public string[] alternativaC; //Armazena alternativas C
 public string[] alternativaD; //Armazena alternativas D
 public string[] corretas;     //Armazena alternativas corretas

 private int idTextPerguntas;

 private float acertos;
 private float questoes;
 private float media;
 private int notaFinal;

 // Use this for initialization
 void Start () {


     idTema = PlayerPrefs.GetInt ("idTema");
     idTextPerguntas = 0;
     questoes = perguntas.Length;


     TextPerguntas.text = perguntas [idTextPerguntas];
     RespostaA.text = alternativaA [idTextPerguntas];
     RespostaB.text = alternativaB [idTextPerguntas];
     RespostaC.text = alternativaC [idTextPerguntas];
     RespostaD.text = alternativaD [idTextPerguntas];

     infoRespostas.text = "Respondendo " + (idTextPerguntas + 1) + " de " + questoes.ToString();
 }