This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Uveitis, Subject name: Ophthalmology
[{'content': 'Which of the following is the commonest infectiuos cause for posterior uveitis? \nSelect and explain. \nA. Toxocara, B. Toxoplasma gondii, C. Taenia solium, D. Plasmodium falciparum', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Toxoplasmosis is the most common cause of posterior uveitis and accounts for around approximately 90 % of focal necrotizing retinitis. causitive agent - Toxoplasmosis gondi. H/O - contact with cat faeces C/F - Vitritis with underlying white-yellow choroiditis patch - \'Headlight in Fog Appearance" other causes of Posterior Uveitis:- Infections toxoplasmois TB(2nd M/C/CAUSE) Toxocariasis CMV,HIV Immune Disorders Sarcodiais PAN Sclroderma', 'role': 'assistant'}]