Identify the muscle labeled "A" in the following figure. 
Definitions:
HIV
Human Immunodeficiency Virus, a virus that attacks the immune system and can lead to AIDS (Acquired Immunodeficiency Syndrome) if not treated.
AZT
A medication used to prevent and treat HIV/AIDS by interfering with the virus’s ability to replicate.
AIDS-related Pneumonia
A severe lung infection, often caused by Pneumocystis jirovecii, occurring predominantly in individuals with weakened immune systems due to AIDS.
Breastfeeding
The act of feeding a baby with milk directly from the mother's breast, providing optimal nutrition and fostering a close maternal bond.
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