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

Gravity is related to pull in the same way magnetism is related to.....

Choose the correct alternative for the given relation.

$8: 81 :\,: 64:$ ?

Choose the correct alternative for the given relation.

Sheep : Mutton

Choose the correct alternative for the given relation.

Heart : Pericardium : : Brain : ?

Sueet is to Chocolate as Book is to......