Jill is Rh-negative. Her first baby was Rh-negative. She is pregnant again, but the baby is Rh-positive. Without medical treatment, will Jill's antibodies attack the baby's blood?
A. Yes
B. No
C. Probably not, because her first child is Rh-negative
D. Probably yes, because her first child is Rh-negative
Answer: C
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