P is the brother of Q and R. S is R's mother. T is P's father. How many of the following statements are definitely true? I. S and T are a couple. II. Q is T's son. III. T is Q's father. IV. S is P's mother. V. R is T's daughter. VI. P is S's son. Select the correct answer using the code given below:

Given: P is brother of Q and R. S is R's mother. T is P's father. Since P, Q, R are siblings (P brother of both), they share parents. T is father of P, so T is also father of Q and R. S is mother of R, so S is also mother of P and Q. Hence S and T are parents — a couple (I true). T is father of Q means Q is T's son OR daughter — Q's gender is unspecified, so 'Q is T's son' is NOT definitely true (II uncertain). 'T is Q's father' is definitely true (III true). S is P's mother (IV true). 'R is T's daughter' — R's gender unspecified, R could be male or female (R has a mother but P is called 'brother of R' which works for any gender of R), so V not definitely true. 'P is S's son' — P is male (called brother), and S is P's mother, so P is S's son (VI true). Definitely true: I, III, IV, VI = four statements. Answer is (c) Only four.