Ali’s brother lik

(i) Ali’s reaction after reading the passage clearly indicates that he has caring and an empathetic attitude towards his brother. At the same time, Ali understands the situation well and could his knowledge at right point and the right time.

(ii) After consumption of medicine, Ali’s brother’s body started itching due to the production of histamines in his body. The doctor will generally prescribe an antihistamine dose to counteract this situation.

(iii) Medicine can be poisonous if the body does not find it to be suitable and it could result in the adverse effect on the body. Therefore it is required to consult doctor before consuming any medicine.

(iv) An agonist is a chemical that binds to a receptor and activates the receptor to produce a biological response. Antagonist is a drug that blocks a receptor.