Captcha.php

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<?php
namespace Magento\Captcha\Block;

class Captcha extends \Magento\Framework\View\Element\Template
{
    protected $_captchaData = null;

    public function __construct(
        \Magento\Framework\View\Element\Template\Context $context,
        \Magento\Captcha\Helper\Data $captchaData,
        array $data = []
    ) {
        $this->_captchaData = $captchaData;
        parent::__construct($context, $data);
        $this->_isScopePrivate = true;
    }

    protected function _toHtml()
    {
        $blockPath = $this->_captchaData->getCaptcha($this->getFormId())->getBlockName();
        $block = $this->getLayout()->createBlock($blockPath);
        $block->setData($this->getData());
        return $block->toHtml();
    }
}