The student chose to do a power point presentation on Chlamydia for their anatomy and physiology class, as it is one of the most commonly diagnosed sexually transmitted diseases in the United States. They found it difficult to learn that Chlamydia is caused by the bacterium Trachomatis. The presentation highlighted that there are over 1.2 million reported cases of Chlamydia annually in the US, with many occurring in the Bronx.