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# Mental retardation in man associated with ***-chromosomal abnormality is usually due to

$\begin{array}{1 1}(A)\;\text{Increase in X-complement}\\(B)\;\text{Decrease in X-complement}\\(C)\;\text{Large increase in Y-complement}\\(D)\;\text{Moderate increase in Y-complement}\end{array}$

Mental retardation in man associated with ***-chromosomal abnormality is usually due to increase in X-complement
Hence (A) is the correct answer.