Which of the following is an inherited trait in man?

Select the incorrect statement from the following.

Consider the following four statements $I, II, III$ and $IV$ and select the correct statement:
$I.$ Mendelian experiments have a large sampling size, which gave greater credibility to the data that he collected.
$II.$ Recessive allele influences the appearance of the phenotype even in the presence of a dominant allele.
$III.$ Mendel analysed qualitative characters in garden pea.
$IV.$ In $F_2$-generation of a Mendelian monohybrid cross, the tall and dwarf traits were identical to their parental types and show no blending inheritance.

Which of the following terms represents a pair of contrasting characters?

Mark the odd one (w.r.t. true breeding line).

Assertion: Cross of $F_1$ individual with recessive homozygous parent is test cross.
Reason: No recessive individuals are obtained in the monohybrid test cross.