Correct option is A
Given - L × M means that L is the mother of M, L – M means that L is the father of M, L ÷ M means that L is the sister of M, then which of the following expression shows that R is the brother of P?
P ÷ R – Q

R is brother of p - true
P × R – Q

R is son of P - false
P ÷ Q – R

Cannot determine gender of R
P ÷ R × Q

R is sister of P.
only option a is correct.