*/ use HasFactory; protected $fillable = ['quiz_id', 'concept_id', 'body', 'explanation']; public function quiz(): BelongsTo { return $this->belongsTo(Quiz::class); } public function concept(): BelongsTo { return $this->belongsTo(Concept::class); } public function options(): HasMany { return $this->hasMany(QuestionOption::class); } }