Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE organisation_Types (organisation_type VARCHAR, organisation_type_description VARCHAR)
TABLE: CREATE TABLE Grants (organisation_id VARCHAR)
TABLE: CREATE TABLE Organisations (organisation_id VARCHAR, organisation_type VARCHAR)

### Question ###
What is the total grant amount of the organisations described as research?

### Accurate SQL ###

SELECT SUM(grant_amount) FROM Grants AS T1 JOIN Organisations AS T2 ON T1.organisation_id = T2.organisation_id JOIN organisation_Types AS T3 ON T2.organisation_type = T3.organisation_type WHERE T3.organisation_type_description = 'Research'