Instruct: Identify the main category of Medrxiv papers based on the titles
Query: Effect of a Pilates exercise program on the flexion-relaxation rate in women with chronic low back pain
5
The categories of this paper are: health
26
The categories of this paper are: systems
39
The categories of this paper are: rheumatology
42
The categories of this paper are: occupational
68
The categories of this paper are: surgery
50
The categories of this paper are: medical
23
The categories of this paper are: gastroenterology
57
The categories of this paper are: primary
19
The categories of this paper are: public
21
The categories of this paper are: psychology
24
The categories of this paper are: oncology
10
The categories of this paper are: infectious
4
The categories of this paper are: reproductive
20
The categories of this paper are: psychiatry
62
The categories of this paper are: orthopedics
64
The categories of this paper are: ophthalmology