Analogy Questions

Select the related word/letters/number from the given alternatives. AIDS : VIRUS : : MALARIA : ?

Select the related word/letters/number from the given alternatives.
Nephrology : Kidney : : Ichthyology : ?

In the following question, select the related number from the given alternatives.
243 : 578 : : 163 : ?

In the following question, select the related number from the given alternatives.
7 : 56 : : 11 : ?

In the following question, select the related word pair from the given alternatives.
Heart : Organ : : ? : ?

Pond is related to Water in the same way as Mountain is related to

Select the related word/letters/number from the given alternatives.
EFGH: LNPR : : ABCD : ?

Select the related word/letters/number from the given alternatives.
APPARENT : RENTAPPA : : MUSCULAR : ?