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_19168 ( "State" text, "Highest point" text, "Highest elevation" text, "Lowest point" text, "Lowest elevation" text, "Mean elevation" text )

### Question ###
what's the lowest point with highest point being mount greylock

### Accurate SQL ###

SELECT "Lowest point" FROM table_19168 WHERE "Highest point" = 'Mount Greylock'