Instruct: Identify the main category of Medrxiv papers based on the titles
Query: Maternal Urinary Phthalate Metabolites are Associated with Lipidomic Signatures Among Pregnant Women in Puerto Rico
45
The categories of this paper are: pharmacology
9
The categories of this paper are: diseases
25
The categories of this paper are: improvement
7
The categories of this paper are: emergency
28
The categories of this paper are: nutrition
61
The categories of this paper are: dermatology
30
The categories of this paper are: radiology
1
The categories of this paper are: sports
72
The categories of this paper are: urology
17
The categories of this paper are: informatics
4
The categories of this paper are: reproductive
73
The categories of this paper are: toxicology
52
The categories of this paper are: nursing
68
The categories of this paper are: surgery
55
The categories of this paper are: obstetrics
60
The categories of this paper are: addiction