How do I do to ask something in if/else structure?

I am a very new beginner in python programming so I hope my question makes sense.

I want to make a program of a medical interview with guided questions depending on the user answers to previous questions.

I started with basic if/else structure but I am blocked because I don't know how to ask something in an if/else structure. For example :

A = input("Question 1 ? ")

if A == "yes":
    print("Consequence of yes to question 1")
else:
    A == "no"
    print("Consequence of no to question 1")

if A == "no":
    B = input("Question 2 ?")

It seems I can't put input statement in an if statement because when I run, it does not take the B = input("Question 2 ?") into account. But I need to assign a yes/no answer to Question 2 so I can pursue the interview. All I saw on the internet is print statements in if/else structure. I also tried to do nested if statements but it doesn't work.

Could someone help me please ? Thanks a lot