​Select the term that will come next in the following series.

1O5, 1P6, 1Q7, _______

​1O5, 1P6, 1Q7, _______

Logic: First number is same; second letter increases by +1 and third number increases by +1

First number: 1, 1, 1, 1

Second letter: O+1=P, P+1=Q, Q+1=R

Third Number: 5+1=6, 6+1=7, 7+1=8

So, Next pair is 1R8

Thus, Option D is the correct answer.