The preparation being shown is:

1. Showing evidence of axonal degeneration.  

2. A teased fiber preparation of a peripheral nerve fiber.

3. The brown stain is due to osmium tetraoxide.

4. The brown pigments are lipofusin pigments due to demyelinating neuropathy.

A.  1,2, and 3 are true.             B.  1 and 3 are true.

C.  2 and 4 are true.                 D.  4 is true.

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