Which one of the following is the odd one?

Answer B is correct. Babar (Babur), Humayun and Akbar all belong to the Mughal dynasty, founded by Babur after his victory at Panipat in 1526. Shershah does not. He founded the Sur dynasty after defeating Humayun at Chausa (1539) and Kannauj (1540).

The anchor is the lineage: Babur, then his son Humayun, then Humayun's son Akbar, who ruled from 1556 to 1605. Humayun lost Delhi to Shershah, went into exile in Persia, and regained the throne in 1555, which is why the Sur interlude gets confused with Mughal rule. Shershah ruled from 1540 to 1545 and is credited with the sarai network, repairs to the Grand Trunk Road and a revenue system that Akbar later built on.

Mains angle: the Sur administration links Sher Shah's revenue reforms to Akbar's zabti system, a useful bridge for questions on agrarian administration in medieval India.

Trap: students pick Humayun because he is the one who lost to Shershah, treating the rivalry as the odd signal. Check the dynasty first, not the battles.