Discussion
Which of the following statements is not true as far as ink composition is concerned ?
Answer: D
The statement that is not true, according to the key, is the one about the rolling marker pen.
Rollerball and similar marker inks are water-based and are coloured by dissolved dyes (gel versions use some pigments), so a claim that they contain inorganic metal oxides does not describe them. The other three statements fit standard accounts: ballpoint inks are dyes in glycol or other solvents, fountain pen inks are either the old iron-gallotannate type or aqueous synthetic dye, and fibre tip inks are solvent or water carriers.
What could not be confirmed: no source was found that states the composition of a 'rolling marker pen' or the exact solvent list for fibre tip inks, so the answer rests on elimination. D is the weakest of the four statements, which is why it is keyed.
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