title: How can I get and store a user's message with python-telegram-bot?
body: <p>I'm writing a Telegram bot that must send an image to a user, get a reply and store it as a string.</p>
  <p>I managed to write the script to start the bot and send the image (very basic, I know), but I can't figure out how to get the answer. Here is a MWE of my script:</p>
  <pre><code>import telegram.ext
  token = '1234567890:ABCdEffGH-IJKlm1n23oPqrst_UVzAbcdE4'
  bot=telegram.Bot(token=token)
  
  user_id = 567890123
  image_path='./image.png'
  
  with open(image_path,'rb') as my_image:
      bot.send_photo(chat_id=user_id,photo=my_image,caption='What is this?')
  
  % Somehow store the answer
  % Do some other stuff
  </code></pre>
  <p>How can I get and store user's answer?</p>
  <p>I can change the script as needed, but to interact with Telegram's API I must use <code>python-telegram-bot</code> only.</p>