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B
Membrane
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C
Skin cells
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D
Sex cells
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Solution
The correct option is C Skin cells In amniocentesis, at an early stage of pregnancy( 14th or 15th week), the location of the foetus and placenta is determined by sonography. Then a small amount of amniotic fluid is drawn by passing a special surgical syringe needle through the abdominal wall and uterine wall into the amniocetic sac containing amniotic fluid. Cells that have sloughed from the foetus's skin or respiratory tract into the fluid are sucked into the syringe.