Discussion
The inert insoluble material that remains after extraction is called :
Answer: D
The inert insoluble residue left after extraction is called marc.
In maceration or percolation, the solvent (menstruum) dissolves the active constituents of the crude drug. The solution obtained is the extract, and the exhausted plant material left behind is the marc, which is pressed to recover the remaining liquid.
A distillate is the condensed vapour collected in distillation. The extract is the useful product, the opposite of the residue. 'Particles' is not a pharmaceutical term for the residue.
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