Who won the bronze medal in womens boxing in Tokyo Olympics 2020?

The correct answer is Lovlina Borgohain.

Let us break down the performance of the mentioned Indian athletes at the Tokyo Olympics 2020 (held in 2021) to understand the correct context:
1. Lovlina Borgohain competed in the women's welterweight (64-69 kg) boxing category. She won the bronze medal after reaching the semifinals, where she lost to Turkey's Busenaz Surmeneli.
2. Mirabai Chanu won the silver medal in weightlifting (women's 49 kg category).
3. MC Mary Kom, a legendary Indian boxer, competed in the flyweight category but was eliminated in the round of 16.
4. Aditi Ashok competed in golf and finished in a commendable fourth position, just missing out on a medal.

Therefore, Lovlina Borgohain was the one who won the bronze medal in women's boxing at the Tokyo Olympics 2020.