Doctor is related to Patient in the same way as Lawyer is related to......... ?

Infrared is to heat as ultraviolet is to..........

Happiness is related to Sorrow in the same way as Comfort is related to

Choose the correct description for the given relation.

Spinach : Fenugreek : Celery

$'Forfeit'$ is related to 'Surrender' in the same way as $'Desist'$ is related to......?

Choose the correct alternative for the given relation.

Professor : Lecture : : Doctor : ?