Available options:
A). Pull the crown off with your fingers. Move the crown all the way out of your mouth..
B). See above for instructions on how to replace the crown. It can be done by fastening a safety pin to either of the crown loops..
C). If you are experiencing pain or minor discomfort in your mouth, the crown may be in your mouth when you first try to get your new teeth. If you are struggling to get the crown out, ask your dentist to repeat the process until you get the crown out of your mouth..
D). If you have lost the crown, you can coat the tooth surface with an over-the-counter dental cement (available at many pharmacies) to temporarily seal the area until a dentist can repair it. Call a dentist as soon as possible..Choose from options above and answer: What most naturally follows?

How to fix a lost dental crown
Get the crown out of your mouth.
Carefully retrieve the crown from your mouth so that you do not drop it or swallow it. If you have already swallowed it, you are not in danger, but the crown will need to be replaced.
Answer:
D).