EXCUSE: CXEESU:: ERODES: ? 

In each of the following questions, select the related letter/word/ figure/ number from the given alternatives.
Ramanujan: Mathematician:: Sushruta:?

Select the option that is related to the fifth number in the same way as the second number is related to the first number and the fourth number is related to the third number.
 52 : 5 :: 100 : 7 :: 164 : ?

In the following question, select the related number pair from the given alternatives.
53 : 35 : : ? : ?

Select the related word/letters/number from the given alternatives.
11 : 1210 : : 10 : ?

Den is to Lion as Aviary is to 

Direction: In the following question, select the related letters from the given alternatives. 

ABDG : CDFI : : EFHK : ?

Four of the following five are alike in a certain way so form a group. Which is the one that does not belong to that group?