The answer is
" A, D "
PGD is a genetic test used IVF(in vitro fertilization to test for an extra or missing embyro. IN addition, PGD is used to detect abnormal genetic diseases.
(a) therefore, answer choice a is correct
(b) This is incorrect, because the test does not use the sperm(uses the embryo).
(c)This is also incorrect, because the test does not use the egg (uses the embryo).
(d) This is also correct
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