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_2430 ( "Period" text, "Births" text, "Deaths" text, "Difference" text, "Crude Birth Rate" real, "Crude Death Rate" real, "Natural Increase" real, "Total Fertility Rate" real, "Infant Mortality Rate" real )

### Question ###
period between 1985 - 1990 have minimum infant mortality rate of what.

### Accurate SQL ###

SELECT MIN("Infant Mortality Rate") FROM table_2430 WHERE "Period" = '1985 - 1990'