<prompt> Which of the following is the most common cause of anterior uveitis?IdiopathicHLA-B27SarcoidosisTuberculosis  <response>: Ans. a IdiopathicRef: Yanoff 2e, p 1115, Review of ophthalmology by William B. Trattler, peter K. Kaiser, Neil J. Friendman 2012, p 299, Esentials of ophthalmology by Neil J. Friedman 1st 2007, p 195 