Final answer:
The most likely complication associated with the extraction of an isolated maxillary second molar is a dry socket. Dry socket is a condition that occurs after tooth extraction when the blood clot fails to develop or is dislodged.
Step-by-step explanation:
The most likely complication associated with the extraction of an isolated maxillary second molar is A. a dry socket. Dry socket, also known as alveolar osteitis, is a condition that occurs after tooth extraction when the blood clot that usually forms in the socket fails to develop or is dislodged. This can result in severe pain, delayed healing, and possible infection.