Let’s understand that GD is conducted to understand and confirm your soft skills like communication, gesture and interpersonal skills etc.
B schools are eager to know you more on the above hence; topics are given of general nature so that entire group can speak at ease.
The more you are cooperative and listen to group members; it will give you good opportunity to come up with your points related to theme of GD topic. Later on your chance when you will speak, others may follow you and you might be declared leader in GD.
Experts’ advice is that in GD giving natural response is the thumb rule to be successful.