Which of the following statements about the pelvis is true？

A.With the boundary as the boundary, it can be divided into the greater pelvis and the lesser pelvis

B.When upright, the male pelvis tilts more than the female

C.The opening under the lesser pelvis is flat

D.The male pelvis is oval and the female pelvis is heart-shaped

正确答案：With the boundary as the boundary, it can be divided into the greater pelvis and the lesser pelvis