text: import React from 'react'
  import './Radio.css'
  class Radio extends React.Component{
    constructor(props){
      super(props);
      this.onFocus = this.onFocus.bind(this);
      this.onBlur = this.onBlur.bind(this);
      this.state={isAnswer: false}
    }
    onFocus(){
      this.Option.setAttribute("class", "focus");
    }
    onBlur(){
      this.Option.setAttribute("class", "");
    }
    render() {
      return (
        <div>
          <label ref={(option) =>{ this.Option = option}}>
            <input type="radio" name = {this.props.groupName}
            value ={this.props.value}
            onChange={this.props.onChange}/>&#160;{this.props.ans}
          </label>
        </div>
      )
    }
  }
  export default Radio;