Is there a Python function to nest user inputs?

I want to read a csv file, ask the user for what column they would like to search, then output summary data for that column. This is what I've done so far:

import csv
data = open('data.csv')
reader = csv.reader(data, delimiter = ',')

category = input("What category would you like to look up? Please enter 'city', or 'state': ")
category = category.upper()

if category == "city":
        city = input("Enter a city: ")
        city = city.upper()
        if row[3] == city:
                print(row)
        else:
                print("That is not a city.")
elif category == "state":
        state = input("Enter a state: ")
        state = state.upper()
        if row[1] == state:
                print(row)
        else:
                print("That is not a state.")

However, no matter what I input after selecting a category, I keep getting the error of this is not a city/state. Where am I going wrong?