In the given question, a statement of Assertion is followed by a statement of Reason. Mark the correct answer. 

Assertion: The teachings, practices, and organization of the Chishtis, as well as their fame, spread rapidly in medieval India.

Reason: Shaikh Nizamuddin appointed several spiritual successors and deputed them to set up hospices in various parts of the subcontinent.

Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.

Shaikh Nizamuddin appointed several spiritual successors and deputed them to set up hospices in various parts of the subcontinent. As a result, the teachings, practices, and organization of the Chishtis as well as the fame of the Shaikh spread rapidly. This in turn drew pilgrims to his shrine, and also to the shrines of his spiritual ancestors.