The viruses infect the host cells. By the induction of viruses the host cells produce the

From unripe opium fruit, the opium is extracted. From this which one of following groups of narcotic drugs are also prepared

‘Hydrophobia' (Rabies) is a disease caused by

In mammals, histamine is secreted by

Oral cancer may be caused by

The depression of nervous activity is caused by which of the following drug