A waveform shown when applied as an input to the following circuit will produce which of the following output waveform. (Assuming ideal diode configuration and ${\mathrm{R}}_1={\mathrm{R}}_2$)

The P-N junctions will conduct only when it is forward biased i.e. when – 5V is fed to it, so it will conduct only for 3rd quarter part of signal shown and when it conducts potential drop 5 volt will be across both the resistors, so output voltage across   is 2.5 V.
$\therefore {\mathrm{V}}_0=-2.5\mathrm{V}$