Select the correct statement.

AIDS is caused by the Human Immunodeficiency Virus (HIV), a member of a group of viruses called retrovirus, which have an envelope enclosing the RNA genome.Pneumonia in humans is caused by bacteria like Streptococcus pneumoniae and Haemophilus influenzae. Rhino virus causes common cold.Cervical cancer is caused by HPV (human papilloma virus). Bird flu is caused by H5N1 virus. H1N1 is a subtype of influenza A virus.