When driving in heavy rain, is it mandatory to use the rear fog light?

A)Yes, both the rear and the front.
B)Yes.
C)No.Correct
FRONT FOG LIGHT:
- Its installation and use is NOT mandatory.
- It shall be white or selective yellow in colour.
- It shall be used, voluntarily, in the event of fog, heavy rain, snowfall, clouds of smoke or dust, or in circumstances similar to the above.
- It may also be used on narrow roads with many bends, i.e. those with a carriageway width of 6.5 m or less, signposted with 'dangerous bends' signs.

REAR FOG LIGHT:
- Its installation and use is mandatory.
- It shall be red in colour.
- It shall be used, mandatorily, in the event of THICK fog, VERY heavy rain, HEAVY snowfall, or DENSE clouds of smoke or dust.

The front fog light, during the day, may be switched on with only the position lights, but may also be used together with the low-beam or high-beam headlights. At night, it shall be used with at least the low-beam headlights.

The rear fog light, during the day, shall be used with at least the front fog light or the low-beam headlights. At night, with at least the low-beam headlights.