Give the social security number of the female Irish patient allergic to grass pollen.
social security number refers to ssn; female refers to gender = 'F'; Irish refers to ethnicity = 'irish'; allergic to grass pollen refers to allergies where DESCRIPTION = 'Allergy to grass pollen';
SELECT T2.ssn FROM allergies AS T1 INNER JOIN patients AS T2 ON T1.PATIENT = T2.patient WHERE T1.DESCRIPTION = 'Allergy to grass pollen' AND T2.ethnicity = 'irish' AND T2.gender = 'F'