Monochorionic monoamniotic twins occur when splitting of zygote occurs:

Correct Answer: At early blastocyst stage
Description: Ans. is d, i.e. At early blastocyst stageMonochorionic: Monoamniotic twins are seen when division occurs at more than 8 days which means Blastocyst is formed we all know Implantation occurs in stage of blastocyst and implantation begins by 6 to 7 days after fertilization and is completed by 10th day after fertilization. Hence between this time the stage is Blastocyst.
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