$event is undefined

In following code, event passed properly but got undefined.

<select chosen  ng-change='fnSelectitem ($event)'>
                                <option value="">Select Account</option>
                                <option ng-repeat="ac in arrCustUUID track by ac.UUID" value="{{ac.CustAC}}" >{{ac.CustAC}} - {{ac.CustName}}</option>
                            </select>

$scope.fnSelectitem = function (e){ 
            e.preventDefault() // e is undefined here 
}

[catch-shailendra]

@leocaseiro got your point thanks for plunker link.

[leocaseiro]

I hope works for you 👍