Which of the following cannot reach the foetus through the placenta?

HIV

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Carbon dioxide gas

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Germs

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Vitamin C

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Solution

The correct option is C
Germs

The placenta is composed of several layers of cells which serves for the diffusion of substances between the maternal and foetal circulatory systems. Recent studies have shown that the placenta is one of the leakiest of all barriers, and allows almost everything from the mother into it, except specific categories of germs.

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