Identify the odd one among the following disorders.

If a colour blind woman marries a normal visioned man,their sons will be

Assertion $(A) :$ Phenylketonuria is an inborn error of metabolism and inherited as the autosomal dominant trait.
Reason $(R) :$ The disease is caused by mutation in the gene that codes for the enzyme phenylalanine hydroxylase.

If both the mother and father are without pigments (albinism),then:

Among symbols $A, B$ and $C$,what does $C$ indicate?

Given below is a pedigree chart showing the inheritance of a certain trait in humans. Select the correct option for the given chart.