Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Strangeness observables and pentaquarks   We review the experimental evidence on firstly, strangeness production as a
signature for the QCD phase transition and secondly, pentaquarks, the latest
and most exotic manifestations of strangeness in hadrons.

8
The categories of this paper are: hep-ex
2
The categories of this paper are: math
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci