Q. Who among the following was the chief architect of the Taj Mahal?
Answer: Ustad Isa
Notes: The chief architect of the Taj Mahal is widely believed to be Ustad Isa, although the project was a collaborative effort involving many artisans, engineers, and architects from across the Mughal Empire and beyond. Ustad Isa was a Persian architect who supervised construction on the orders of Emperor Shah Jahan. While Ahmad Lahori and others also contributed, Ustad Isa is traditionally credited as the principal architect in historical literature regarding the Taj Mahal.