Explanation:

- Naveen Kumar: One of the given options for athletes who might be active in international boxing circuits. No specific achievements related to the GeeBee Boxing Tournament are mentioned in recent history for him.

- Sachin Siwach: A notable Indian boxer known for his participation in international contests. Recent records and public reports do not highlight him winning a silver medal at the GeeBee Boxing Tournament in Helsinki.

- Sumit Sangwan: A recognized Indian boxer with a history of participating in international competitions. However, there are no current updates linking him to a silver medal win at this specific tournament.

- Mohammed Hussamuddin: An accomplished Indian boxer with several international accolades. He has been confirmed to have won a silver medal at the GeeBee Boxing Tournament in Helsinki, Finland.

Correct Answer: Mohammed Hussamuddin