Main barrier which prevents the entry of disease's causing organism in our body is

After drinking alcohol, a person walks clumsily because, the alcohol affects his

Symptoms of diphtheria is

$X$ - $CO$ is responsible for skin cancer

$Y$ - Strong magnetic field is used in $MRI$ to diagnose cancer

Chagas disease is caused by

A boy happens to put his foot on a rusted nail and the doctor gives him an injection. Most likely he has given