A 10-year-old boy weighing 25 kg is brought with continuous fever for the past 7 days. Initially the fever was mild, but has gradually increased and the body temp. now is $103^{\circ}F$. The boy also complains of abdominal pain, bloating, loose motions, loss of appetite, occasional vomiting, weakness, malaise and cough. A local doctor had given some tablets for the past 3 days, but the condition has worsened. He looks ill, mildly dehydrated with coated tongue; pulse is 70/min, abdomen is distended and tender on pressing. Liver and spleen are palpable. The total leucocyte count is 5000/cu mm. Blood for culture is sent. A provisional diagnosis of typhoid (enteric) fever is made. (a) What are the drugs used for treating enteric fever? (b) Which is the Drug of choice for MDR (Multi-Drug Resistance) Typhoid (enteric) fever? (c) How are these drugs classified? Write the mechanism of action of this drug. (d) Can we use fluoroquinolones for treating this fever? Write down the mechanism of action and uses of fluoroquinolones