Which of the following is an example of a sex-linked disease?

Assertion : Persons suffering from haemophilia fail to produce blood clotting factor $VIII$.
Reason : Prothrombin producing platelets in such persons are found in very low concentration.

If the mother has a genotype of $Hb^{A}Hb^{S}$ and the father has a genotype of $Hb^{A}Hb^{S}$,what is the probability of having an affected son (in $\%$)?

Cystic fibrosis,Myotonic dystrophy,and Thalassemia are:

Match Column-$I$ with Column-$II$ and select the correct option.

Column-$I$	Column-$II$
$(P)$ Haemophilia	$(i)$ Recessive gene: $X^{h}X^{h}$
$(Q)$ Colour blindness	$(ii)$ Recessive gene: $pp$
$(R)$ Phenylketonuria	$(iii)$ Recessive gene: $Hb^{s}Hb^{s}$
$(S)$ Sickle-cell anaemia	$(iv)$ Recessive gene: $X^{c}X^{c}$

Which of the following is a genetic disorder?