Dear Sanghamitra Kundu,
Good day!!
I understand you are not able to see the correct answer option to set for the questions in the Microsoft Form which you are integrating in the Team of Microsoft Teams.
If yes, I would like to let you know that the correct answer option is only available for the Microsoft Quiz but not for the Microsoft Form. So, I suggest you to follow the below steps and check the outcome:
Go to the Office 365 Home page ( https://portal.office.com )> Click on the App Launcher (9 dots at the top left) > Forms> Click on the down arrow beside + New Form> New Quiz> Create a questions as per your requirement and set the correct answers to them.
Now go to the Team in the Microsoft Teams> General Channel> Click on + (Add tab) > Forms> Add an existing Form> Select the newly created Quiz> Collect Responses> Click on Save
Now all the members in the team will be able to submit the responses and you can see the responses of the Quiz by going to the https://forms.office.com
Hope the above information provided helps your scenario and thanks for your patience.
Have a good day!!
Best Regards,
Sophia