You can randomize the answers in the Multiple Choice or Multiple Response question categories but have certain answer options locked in their position. It is useful if one of the choice is 'Other' or "No Answer" that is usually added at the end of the list.
To lock an answer choice position:       
  1. Click an answer in the Answer panel
  2. Click the Lock in the drop-down menu

To unlock the answer position, select an answer and choose Unlock from the drop-down menu.