In a code language ‘MATHEMATICS’ is written as ‘LBSIDNZUHDR’. How is ‘CHEMISTRY’ written in that code language?

The correct option is BIDNHTSSX.

Let's analyze the coding pattern used for the word 'MATHEMATICS' to get 'LBSIDNZUHDR'.

If we look at each letter of the original word and its corresponding letter in the coded word, we can see a pattern of alternating subtraction and addition by 1 position in the alphabetical sequence (-1, +1, -1, +1, ...):

M - 1 = L
A + 1 = B
T - 1 = S
H + 1 = I
E - 1 = D
M + 1 = N
A - 1 = Z
T + 1 = U
I - 1 = H
C + 1 = D
S - 1 = R

Now, applying the exact same rule (-1, +1 pattern) to the word 'CHEMISTRY':

C - 1 = B
H + 1 = I
E - 1 = D
M + 1 = N
I - 1 = H
S + 1 = T
T - 1 = S
R + 1 = S
Y - 1 = X

Thus, 'CHEMISTRY' is written as BIDNHTSSX.