Hi Shiva,
Hope you are doing great. I understand the fact that you did your graduation from GITAM deemed to be University, Vishakhapatnam in BSc (HONS) in Chemistry and CAT 2021 Application form gives you option for "Bs/BSc" and not HONS.
It is not a problem, you can select BSc. This is done to segregate candidates based on their backgrounds (eg Engineers, Doctors, General / Commerce grads, etc).
Hope this helps.
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