The ________was built to commemorate the end of the ________ in the city.

The correct answer is, option (1) i.e. Charminar; Plague.

• The Charminar is a massive arch in Hyderabad built by Mohammed Quli Qutab Shah, in 1591 to commemorate the end of the plague in the city. 
• The symbol of the city, the Charminar, is an impressive square monument with four minarets. 
• The monument is a magnificent square edifice of granite, built upon four grand arches facing North, South, East, and West.
• It is these four (char) minarets (Minar) that give the building, its name 'Charminar'. Each Minar stands on a lotus-leaf base, a special recurrent motif in Qutub Shahi buildings.
• The clocks above each of the four archways were added in 1889.