David and Katie Have Always Been Close

Multiple Choice

David and Katie have always been close. In fact, they are so close that they shared the womb when their mother was pregnant with them. Given the information that you have already been given in this question, which of the following can you state conclusively?

A) ​David and Katie are monozygotic twins.
B) ​David and Katie are conjoined twins.
C) ​David and Katie are dizygotic twins.
D) ​David and Katie share 25% of their genotype.