Final answer:
The Takayama test, also known as the hemochromogen test, is the confirmatory test that produces brown crystals when applied to blood.OPTION C.
Step-by-step explanation:
The confirmatory test that forms brown crystals when applied to very small amounts of blood is the Takayama test, which is also known as the hemochromogen test.
When the reagents of this test come into contact with the hemoglobin in a blood sample, they result in the formation of distinctive pinkish-brown crystals of pyridine hemochromogen under microscopic examination. This test is specifically mentioned in the context of forensic science for the confirmation of the presence of blood.