A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
C) If assertion is true but reason is false.
D) If the assertion and reason both are false.
E) If assertion is false but reason is true.
Correct Answer: A
Solution :
\[_{38}^{90}Sr\] decays to \[_{39}^{90}Y\] by the emission of \[\beta -\]rays. \[Sr\] gets absorbed in bones along with calcium. Reason is also true. \[^{90}Sr{{\xrightarrow{\beta }}^{90}}Y\] which emits \[\beta -\]rays of very high energy. \[Sr\] does not emit \[\gamma -\]rays. The damage is by the \[\beta -\]rays only.
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