Final answer:
The bone with posts on either side and teeth in the middle is the mandible, which is the lower jawbone with teeth sockets and connects to the skull at the temporomandibular joints.
Step-by-step explanation:
The bone described by the student, which feels like it has posts on either side and teeth in the middle, is most likely d) The mandible. This bone is known as the lower jaw and holds the lower teeth, making it easy to identify by its characteristic "teeth" in the middle. It connects to the skull at two points, which could be thought of as the "posts" on either side referred to in the question.
Explanation: The mandible is the bone that forms the lower jaw and holds the lower dental arch, making it unique in this aspect compared to other bones like vertebral bones, rib bones, or hand bones. The "teeth" in the middle are the actual teeth sockets where the lower teeth are embedded. Furthermore, the mandible connects to the temporal bones of the skull at the temporomandibular joints, which are the "posts" described by the student.