Consider the following.
A + B means A is the son of B.
A – B means A is the wife of B.
What does the expression P + R – Q mean?

Correct Option: Q is the father of P.

Let us break down the given relationship expression step-by-step based on the rules provided in the question:

1. "A + B" means A is the son of B.

2. "A - B" means A is the wife of B.

Now, let us analyze the expression P + R - Q from left to right:

Step 1: Decode "P + R"

Using the rule for '+', P + R means P is the son of R.
This implies P is male and R is a parent of P.

Step 2: Decode "R - Q"

Using the rule for '-', R - Q means R is the wife of Q.
This implies R is female and Q is male (the husband of R).

Step 3: Combine the relations

Since R is the mother of P (as P is the son of R, and R is female) and Q is the husband of R, it follows that Q is the father of P.

Therefore, the expression P + R - Q means that Q is the father of P.