Which of the following characteristics of aspirin is responsible for the prevention of a heart attack?

$A$ doctor prescribed the drug $Equanil$ to a patient. The patient was likely to have symptoms of which disease?

Chloroxylenol is an example of

Which one is a communicable disease?

$A$ chemist has $4$ samples of artificial sweetener $A, B, C$,and $D$. To identify these samples,he performed certain experiments and noted the following observations:
$(i)$ $A$ and $D$ both form blue-violet colour with ninhydrin.
$(ii)$ Lassaigne extract of $C$ gives positive $AgNO_{3}$ test and negative $Fe_{4}[Fe(CN)_{6}]_{3}$ test.
$(iii)$ Lassaigne extract of $B$ and $D$ gives positive sodium nitroprusside test.
Based on these observations,which option is correct?

$A$ broad spectrum antibiotic is