- AGerman silver $Cu + Zn + Ni$
- BAlnico $Fe + Al + Ni + CO$
- ✓Monel metal $Cu + Zn + Sn$
- DDuralumin $Al + Cu + Mg + Mn$
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Assertion $A$ : $Image-I$ can be easily reduced using $Zn - Hg / HCl$ to $Image-II$
Reason $R : Zn - Hg / HCl$ is used to reduce carbonyl group to $- CH _2-$ group.
In the light of the above statements, choose the correct answer from the options given below:

Arginine, Phenylalanine, Aspartic acid, Cysteine, Histidine, Valine, Proline
They were labelled $ A$ and $B$ for testing.
$A$ and $ B $ were separately taken in test tubes and boiled with $NaOH$ solution.
The end solution in each tube was made acidic with dilute $HN{O_3}$ and then some $AgN{O_3}$ solution was added.
Substance $B$ give a yellow precipitate.
Which one of the following statements is true for this experiment