<prompt> Answer this question truthfullyWhat is toxoplasmosis and how does it present in HIV patients?  <response>: <reason> Toxoplasmosis is a CNS protozoal infection caused by the parasite Toxoplasma gondii. In HIV patients, it can present with brain abscesses and is seen as ring-enhancing brain lesions on CTMRI scans. This is because the immune system in HIV patients is weakened, making them more susceptible to infections such as toxoplasmosis. 