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 table_5851 ( "Designation" text, "Car numbers" text, "Manufacturer" text, "Model No." text, "First used" text, "Quantity" real )

### Question ###
Which Designation has a Manufacturer of siemens, and a Quantity of 52?

### Accurate SQL ###

SELECT "Designation" FROM table_5851 WHERE "Manufacturer" = 'siemens' AND "Quantity" = '52'