Identify the reagent $R$ used in the following reaction:
$\text{Ketone} \xrightarrow{R} \text{Semicarbazone}$
$\text{Ketone} \xrightarrow{R} \text{Semicarbazone}$
- A$NH_2OH$
- B$NH_2NHCONH_2$
- C$NH_2NHC_6H_5$
- D$NH_2-NH_2$
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