Burger—-> PooPoo
Common Knowledge
Chordates (phylum Chordata) are animals which are either vertebrates or one of several closely related invertebrates. They are united by having, for at least some period of their life cycle, a notochord, a HOLLOW DORSAL NERVE CORD
Out of the options I would have to say Penetrating Keratoplasty, I am not sure
Find the attachment for the answer.
Note: I have added the complete question in the attachment.