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Who reported that Down's syndrome is due...

Who reported that Down's syndrome is due to extra 21st chromosome

A

j.l Down (1866)

B

Lejeune (1959)

C

Klinefelter (1942)

D

Huntington(1872)]

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The correct Answer is:
A
Down's syndrome is due to trisomty of `21^(st)` choromosome was first reported in 1866 by Langdon Down.
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