<prompt> Which of the following leads to communicating hydrocephalus?Choroid plexus papillomaArnold Chiari malformationDandy walker malformationVein of Galen malformation  <response>: In Choroid plexus papilloma- communicating hydrocephalus occurs due to increased production of CSF. Rest are causes of obstructive hydrocephalus- obstruction to flow of CSF 