Histamine in the blood is released by:

1.	Mast cells	2.	Macrophages
3.	Fibroblasts	4.	Basophils

Steroid abuse in males does not cause:

1. Decrease in size of the prostate
2. Acne
3. Breast enlargement
4. Reduction of testicle size

A drug that depresses brain activity and produces feeling of calmness, relaxation, and drowsiness, is :

A drug used to treat attention deficit disorder is :

The part of the brain most commonly affected by the consumption of alcohol is :

Methanol is converted to formaldehyde in our bodies. It inhibits mitochondrial cytochrome c oxidase. It also causes blindness. The treatment of methanol toxicity is :

The most common opportunistic infection associated with AIDS is :

1. Tuberculosis

2. Pneumocystis carinii pneumonia

3. Cryptococcal meningitis

4. Toxoplasma encephalitis

The class of antibodies involved in allergic response is:

Which of the following is a recombinant vaccine?

Graft rejection is due to:

1. Innate immune response
2. Humoral immune response
3. Cell-mediated immune response
4. Auto-immune response