Which of the following statements about technology PGD is not true？（)
A. PGD ensures every baby it produces is free of potential cancers.
B. PGD first screens and picks out embryos having no genetic cancer genes.
C. PGD is an extra procedure to the normal in-vitro fertilization (IVF).
D. PGD then implants several healthy embryos into a mother’s womb.
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