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                              Q:
                           
                           
                                                      | A) eating contaminated food and water | B) transfusion of contaminated blood and blood products | 
| C) inhaling polluted air | D) shaking hand with infected person | 
                              Answer:   B) transfusion of contaminated blood and blood products
                              
                                                            
                              
Explanation:
                               
                           
                           Explanation:
AIDS is caused by the Human Immuno deficiency Virus (HIV), a member of a group of viruses called retrovirus, which have an envelope enclosing the RNA genome. Transmission of HIV-infection generally occurs by (a) sexual contact with infected person, (b) by transfusion of contaminated blood and blood products, (c) by sharing infected needles as in the case of intravenous drug abusers and (d) from infected mother to her child through placenta.
 
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