title: Multi level pie chart in d3
body: <p><a href="https://i.stack.imgur.com/4yGqK.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/4yGqK.png" alt="enter image description here" /></a></p>
  <p>How can I create multi level pie chart like this in D3.</p>