In each of the following questions, a word is transformed into another using a specific alphabetic pattern (such as letter shifting or substitution). Apply the same transformation to the third word to determine the correct answer from the given options. HOUSE : GNTRD :: ? : KHFGS

Correct — D. Compare HOUSE with GNTRD letter by letter.

Rule: every letter moves back 1 (H → G, O → N, U → T, S → R, E → D).

Here the code KHFGS is given and the word is missing, so undo the rule: move each code letter forward 1.

K + 1 = L, H + 1 = I, F + 1 = G, G + 1 = H, S + 1 = T
That spells LIGHT, option (d).

Why the others are wrong

• (a)
  SIGHT — SIGHT would be coded RHFGS, because S − 1 = R. The given code starts with K, so the word must start with L.
• (b)
  FIGHT — FIGHT would be coded EHFGS, since F − 1 = E. All four options share IGHT → HFGS, so the first letter decides, and it must be K + 1 = L.
• (c)
  MIGHT — MIGHT would be coded LHFGS, since M − 1 = L. The given code starts with K, one step before L, so the word itself starts with L.

A letter-shift analogy moves every letter the same number of places. Read the step from the complete pair, then apply it.

When the question mark sits on the word side, as in ? : KHFGS, the step runs the other way. HOUSE → GNTRD is −1, so going from a code back to its word is +1.

IGHT → HFGS is common to all four options, so the first letter alone settles this item.

Key facts

• HOUSE → GNTRD moves each letter back one place.
• KHFGS moved forward one place gives LIGHT.
• Moving KHFGS back one place instead gives JGEFR, which is not a word.

Common traps

• Applying −1 to KHFGS instead of undoing it.
• Picking MIGHT because its code begins with L, the letter the answer word itself begins with.

No directly related past PYQ was found.