Step 1: Identify the coding rule.
ANSWER is coded as DQVZHU. Checking each letter: A+3=D, N+3=Q, S+3=V, W+3=Z, E+3=H, R+3=U. Each letter is shifted forward by 3 positions in the alphabet.
Step 2: Apply the same shift to QUESTION.
Q+3=T, U+3=X, E+3=H, S+3=V, T+3=W, I+3=L, O+3=R, N+3=Q.
Step 3: Form the coded word.
QUESTION is coded as TXHVWLRQ.
\[ \boxed{\text{TXHVWLRQ}} \]