Carbylamine test is for the detection of

Carbylamine test is for the detection of primary amines

The carbylamine reaction only occurs in the presence of primary amines, thus we may use it as a chemical test to determine their existence. The Hofmann's isocyanide test is another name for the carbylamine reaction when it is used as a test. The test substance is heated in this instance using chloroform and alcoholic potassium hydroxide.

Hence option A is correct