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.

2 : 9 :: 6 : 121 :: 5 : ?

Select the option that is related to the third term in the same way as the second term is related to the first term and the sixth term is related to the fifth term.

5 : 127 :: 9 : ? :: 7 : 247

Select the option that is related to the third word in the same way as the second word is related to the first word.

(The words must be considered as meaningful English words and must not be related to each other based on the number of letters/number of consonants/vowels in the word.)

X-Ray : Radiologist :: Skin : ?

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.

3125 : 25 :: 1600 : 20 :: 675 : ?