RD 15 is related to UI -1 in a certain way. In the same way, WG 13 is related to ZL -3. To which of the following is OG 1 related, following the same logic?

To find the related term for OG 1, let us analyze the pattern established by the two given pairs:

Pair 1: RD 15 is related to UI -1
Let us find the alphabetical positions of the letters (where A = 1, B = 2, ..., Z = 26):
- $R=18$ and $D=4$
- $U=21$ and $I=9$

Now let's determine the operations applied to the letters and numbers:
- First letter: $18+3=21$ (R → U)
- Second letter: $4+5=9$ (D → I)
- Number: $15-16=-1$

Pair 2: WG 13 is related to ZL -3
Let us verify the pattern using the second pair:
- $W=23$ and $G=7$
- $Z=26$ and $L=12$

Applying the same operations:
- First letter: $23+3=26$ (W → Z)
- Second letter: $7+5=12$ (G → L)
- Number: $13-16=-3$
The pattern is consistent.

Applying the pattern to OG 1:
- $O=15$ and $G=7$

Let us perform the same operations:
- First letter: $15+3=18$, which corresponds to R
- Second letter: $7+5=12$, which corresponds to L
- Number: $1-16=-15$

Combining these elements, we get RL -15.