Twin pregnancy of the same age and sex rules out ?
Superfetation It is the simultaneous occurrence of more than one stage of developing offspring in the same animal. In mammals, it manifests as the formation of an embryo from a different estrous cycle while another embryo or fetus is already present in the uterus. Ref : Dutta book of obstetrics 8th Ed
Superfetation
Maternal twins
Superfecundation
None of the above
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