This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infectious disease, Subject name: Pediatrics
[{'content': 'Which microorganism is responsible for classical presentation of hydrocephalus, chorioretinitis and intracerebral calcification? \nSelect and explain. \nA. Toxoplasmosis, B. Rubella, C. Measles, D. CMV', 'role': 'user'}, {'content': 'Answer: A \nExplanation: *Toxoplasmosis is caused by toxoplasma Gondi . * the classical triad of toxoplasmosis is intracranial calcification, hydrocephalus and chorioretinitis. Infants asymptomatic at bih may later present with mental retardation and deafness . *The diagnosis is confirmed by demonstrating a positive toxoplasma IgM antibody in the serum of the affected child. Reference : Ghai essential pediatrics, 9 th edition, pg no:264', 'role': 'assistant'}]