How do I use if else statement in reading a spesific line of a text file with Python

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Python

Hello. So I was just messing around with reading text files in Python. I decided to read a spesific line of the text file, and use if else statement. Unfortunately, the result isn't my expectation. Here is my code:

file = open('testing.txt')
lines = file.readlines()
errorinfo = lines[0]

if errorinfo == "A":
    print("Yes you are A!")

else:
    print("No you're not A!")

And the text file content:

A
B
C

The code still detects as "not A".

What I have tried:

The solution I have tried is to write it without a variable (writing it directly in the if else statement)