title: How to keep the context of the response of the agent for the next dialog of the user in Dialogflow
body: <p>I am developing a Quiz bot with Dialogflow platform. When it is instructed to initiate the game, a question is generated from the webhook call and displayed to the user. A reference of that particular question is needed to be sent back with the user's answer to the webhook in order to validate the answer. I am finding it difficult to send back the reference of the previous response of the agent. </p>
  
  <p>Any useful idea will be very much appreciated. </p>
  
  <p>Intended scenario to develop as below.</p>
  
  <pre><code>Bot : Shall we begin?
  User : Yes begin.
  Bot : What is the highest mountain in the world? 
    A. Mount Everest
    B. Gyachung Kang
    C. MOunt Fuji
  User : A
  Bot : That is correct. Next question is : 
    First Afghan War took place in?
    A. 1833
    B. 1843
    C. 1839
  User : B
  Bot : That is incorrect. Your next question is...
  </code></pre>