The cause of Turner's syndrome in man is
In human, which disorder is cussed due to the absence of one of the $X$ chromosomes i.e., $45$ with $XO$ ?
Match list I with List $II$ and select the correct answer using code given below
List $I$ $(syndrome)$
$(1)$ Patau’s syndrome
$(2)$ Kline-Felter’s syndrome
$(3)$ Down’s syndrome
$(4)$ Turner’s syndrome
List $II$ $(Chromosomal\, abnormality)$
$(A)$ $44 + XXY = 47$
$(B)$ $44 + X = 45$
$(C)$ $46 + 1 = 47$, Chromosome $13^{th}$
$(D)$ $46 + 1 = 47$, Chromosome $21^{st}$ Code
Euploidy is best explained by