This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Skin
A child patient comes to OPD with history of black central arch rashes on his body. What is your diagnosis? 
Select and explain. 
A. Meningococcemia, B. Dengue hemorrhagic fever, C. Leptospirosis, D. Scrub typhus
A: Meningococcemia
Answer: A: Meningococcemia 
Explanation: Ans. A. MeningococcemiaAcute meningococcemia* In primary stage, it may mimic a viral disease (nonspecific).* Any organ of the body can be affected by vasculitis and thromboembolic disease.* Black central arch and surrounding ring or erythema is the characteristic meningococcal rash and it is often seen before more serious signs develop.Rapid progression is seen in a fulminant case with disseminated intravascular coagulation, septic shock, adrenal hemorrhage, acidosis, and renal and heart failure.* Petechiae and purpura +- meningitis = purpura fulminans (DIC)* Emergency treatment: IV penicillin