Adelle receives an artificial hip to ease her arthritis. Kwan receives a pacemaker to regulate his heartbeat. Hector receives a replacement heart valve from a cow. Denise receives a kidney donated by her identical twin.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which surgery is most like the way a transgenic organism is made?
Possibilities:
- Adelle receives an artificial hip to ease her arthritis.
- Kwan receives a pacemaker to regulate his heartbeat.
- Hector receives a replacement heart valve from a cow.
- Denise receives a kidney donated by her identical twin.

Hector receives a replacement heart valve from a cow.