what is the number of drug pregnancy categories in the united states?
Value
5
class entity
medicine.drug_pregnancy_category m.09c7w0
medicine.drug_pregnancy_category location.country
Drug pregnancy category united states
count none
medicine.drug_pregnancy_category.country
Country
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX : <http://rdf.freebase.com/ns/> 
SELECT (COUNT(?x0) AS ?value) WHERE {
SELECT DISTINCT ?x0  WHERE { 
?x0 :type.object.type :medicine.drug_pregnancy_category . 
VALUES ?x1 { :m.09c7w0 } 
?x0 :medicine.drug_pregnancy_category.country ?x1 . 
FILTER ( ?x0 != ?x1  )
}
}
(COUNT (AND medicine.drug_pregnancy_category (JOIN medicine.drug_pregnancy_category.country m.09c7w0)))