Final answer:
The male pelvis is characterized by a triangular obturator foramen, which helps distinguish it from the female pelvis.
Step-by-step explanation:
The characteristic of the male pelvis that is listed among the options is A) triangular obturator foramen. In the male pelvis, the obturator foramen is an opening bordered in part by the sacrospinous and sacrotuberous ligaments. This structure is important in distinguishing between male and female pelvic anatomy, along with several other key differences such as the shape of the pelvic inlet, sciatic notches, and subpubic angle. The male pelvis is generally narrower and deeper than the female pelvis, and the ischial spine oftentimes points more posteriorly, which is not one of the characteristics listed in the question.