Who among the following defeated Mughal emperor Humayun at Chausa?

Sher Khan

The correct answer is Option 3- Sher Khan

Sher Khan defeated Mughal emperor Humayun at Chausa.

Mirza Hakim was Humayun's half-brother, Safavid Shah was the ruler of Iran, and Mirza Kamran was another half-brother of Humayun. None of these three defeated Humayun at Chausa.

The Battle of Chausa was fought on June 26, 1539, between Humayun and Sher Khan, who was the governor of Bihar under the Mughals. Sher Khan was a brilliant military strategist, and he inflicted a heavy defeat on Humayun. Humayun was forced to flee the battlefield, and Sher Khan went on to establish the Suri dynasty.

The Battle of Chausa was a major turning point in Indian history. It marked the end of the Mughal Empire's first century of rule in India, and it ushered in a new era of Afghan rule under the Suris.