Read random line from .txt file

I'm trying to upgrade my Hangman game by reading random words from a .txt file. Thing is, I can't figure out how to read a random line from the .txt file. There are single words on every new line of the .txt file.

void ler_palavras()
{
    FILE *words;

    if ((words = fopen("words.txt", "r")) == NULL) {
        printf("Error! opening file");
        exit(1);
    }

    // reads text until newline
    fscanf(words,"%[^\n]", word);
    fclose(words);
}