Which of the following compounds gives a yellow precipitate on warming with $\mathrm{I}{}_2$ and aqueous $\mathrm{NaOH}$?

The iodoform test is given by compounds containing $\mathrm{CH}{}_3\mathrm{CO}{}^{-}$ or $\mathrm{CH}{}_3\mathrm{CH}(\mathrm{OH}){}^{-}$. Propan-2-ol, $\mathrm{CH}{}_3\mathrm{CH}(\mathrm{OH})\mathrm{CH}{}_3$, is oxidised by $\mathrm{NaOI}$ to propanone, which then gives $\mathrm{CHI}{}_3$. Methanal, pentan-3-one and benzaldehyde have no such unit.