$$PQR$$ is a triangle such that $$PQ = PR$$. $$RS$$ and $$QT$$ are the median to the sides $$PQ$$ and $$PR$$ respectively. If the medians $$RS$$ and $$QR$$ intersect at right angle, then what is the value of $$\left(\frac{PQ}{QR}\right)^2$$?

A

$$\frac{3}{2}$$

B

$$\frac{5}{2}$$

C

2

D

None of these