How to create two radio buttons on one uitableview cell

I have created two radio buttons on one tableview cell.That are options for a question,But when I select them they both are get selected that I don't want,I want to select only one of them but I am not able to do that......Please help me Here is my code for customCell

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *cellIdentifier = @"cell";
    customCell *cell = (customCell *)[tableView dequeueReusableCellWithIdentifier:cellIdentifier];
    if (cell == nil)
    {
        NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"customCell" owner:self options:nil];
        cell = [nib objectAtIndex:0];

    }

    leftBtnclick = [UIButton buttonWithType:UIButtonTypeCustom];
    [leftBtnclick setTag:0];
    [leftBtnclick setImage:[UIImage imageNamed:@"unchecked.png"] forState:UIControlStateNormal];
    [leftBtnclick setImage:[UIImage imageNamed:@"checked.png"] forState:UIControlStateSelected];
    [leftBtnclick setFrame:CGRectMake(50, 120, 30, 30)];
    [leftBtnclick addTarget:self action:@selector(leftTickBtnClicked:) forControlEvents:UIControlEventTouchUpInside];
    [cell.contentView addSubview:leftBtnclick];

    rightBtnclick = [UIButton buttonWithType:UIButtonTypeCustom];
    [leftBtnclick setTag:1];
    [rightBtnclick setImage:[UIImage imageNamed:@"unchecked.png"] forState:UIControlStateNormal];
    [rightBtnclick setImage:[UIImage imageNamed:@"checked.png"] forState:UIControlStateSelected];
    [rightBtnclick setFrame:CGRectMake(180, 120, 30, 30)];
    [rightBtnclick addTarget:self action:@selector(rightTickBtnClicked:) forControlEvents:UIControlEventTouchUpInside];
    [cell.contentView addSubview:rightBtnclick];


    cell.numberLbl.text = [numberArray objectAtIndex:indexPath.row];
    return cell;
}


-(void)leftTickBtnClicked:(id)sender
{
    if ([leftBtnclick isSelected]) {
        [sender setImage:[UIImage imageNamed:@"unchecked.png"] forState:UIControlStateNormal];

    else
    {
      [sender setImage:[UIImage imageNamed:@"checked.png"] forState:UIControlStateNormal];

    }



}

-(void)rightTickBtnClicked:(id)sender
{
    if ([sender isSelected])
    {
         [sender setImage:[UIImage imageNamed:@"unchecked.png"] forState:UIControlStateNormal];
    }
    else
    {
        [sender setImage:[UIImage imageNamed:@"checked.png"] forState:UIControlStateNormal];
    }



}

via Chebli Mohamed