Which drug is used to reduce high blood pressure?

Into how many main types are diseases classified?

Nowadays,the early diagnosis of bacterial or viral infections in humans is possible using:

Which of the following factors are essential for maintaining good health?

Grafting between two different species is known as:

$A$: Many countries have banned the use of antibiotics in cattle feed.
$R$: Dairymen give antibiotics in the feed to cattle,and it becomes a breeding ground for antibiotic-resistant bacteria.