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Although barriers in the body such as the blood-brain barrier and the placenta protect the brain and developing fetus, respec

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Ans. Drug A  

Forms of passage of substance across the blood brain barrier

Passive diffusion : fat soluble substances dissolve in the cell membrane and cross the barrier e. g. (alcohol, nicotine and caffeine).

Water soluble substances such as penicillin have difficulty in getting through.

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