In each of the questions 1 to 16, out of four options only one is correct. Write the correct answer.

In Fig. 2.13, PQ ⊥ RQ, PQ = 5 cm and QR = 5 cm. Then ∆ PQR is

(A) a right triangle but not isosceles

(B) an isosceles right triangle

(C) isosceles but not a right triangle

(D) neither isosceles nor right triangle