Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Polonnaruwa meteorite: oxygen isotope, crystalline and biological
  composition   Results of X-Ray Diffraction (XRD) analysis, Triple Oxygen Isotope analysis
and Scanning Electron Microscopic (SEM) studies are presented for stone
fragments recovered from the North Central Province of Sri Lanka following a
witnessed fireball event on 29 December 2012. The existence of numerous
nitrogen depleted highly carbonaceous fossilized biological structures fused
into the rock matrix is inconsistent with recent terrestrial contamination.
Oxygen isotope results compare well with those of CI and CI-like chondrites but
are inconsistent with the fulgurite hypothesis.

37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol