<prompt> Central dot sign on CT SCAN -Carolis diseasePrimary sclerosing cholangitisPolycystic liver diseaseLiver hamartoma  <response>: Ans. is a i.e., Carolis disease o Central Dot sign on CT or USG is seen in i Carolis disease most common cause; ii Prebiliary cysts; iii Obstructive jaundice; and iv Periportal lymphedema. 