<prompt> Which of the following is a secondary cutaneous diseases?IchthyosisPsoriasisLichen planusReiters disease  <response>: The skin involvement is secondary in Reiters disease which is primarily characterised by ahritis, urethritis and uveitis. While psoriasis, lichen planus and icthyosis exhibit dermatological manifestations as their primary clinical features. Ref: Harrisons Textbook of Internal Medicine, 17th Edition, Page 2174; Inherited Metabolic Diseases: A Clinical Approach By Georg F. Hoffmann, Johannes Zschocke, William L. Nyhan, Pages 204-205; Psoriasis and Psoriatic Ahritis: An Integrated Approach By Kenneth B. Gordon, Eric M. Ruderman, Pages 23-26, 67-72 