This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
Which of the following is not included in the triad of Reiter's syndrome – 
Select and explain. 
A. Conjuctivitis, B. Urethritis, C. Arthritis, D. Keratoderma blenorrhagica
D: Keratoderma blenorrhagica
Answer: D: Keratoderma blenorrhagica 
Explanation: Classical triad of Reiter's syndrome is reactive arthritis, conjuctivitis and urethritis. Keratoderma blenorrhagica occurs, but it is not included in triad of Reiter's syndrome.