Task: Class Relation Understanding (ontology: Sciences/Biology)

Which of the following classes is one valid superclass of 'uterine dilation and curettage for termination of pregnancy'?

A. 20-oxo steroid
B. uterine dilation and curettage
C. 47,XXY/46,XX mosaic Klinefelter syndrome
D. 46,XY

Answer: uterine dilation and curettage