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: Medicine
A 26 year old pregnant woman presents with ahritis and a malar rash which worsens exposed to sunlight. She has a low-grade fever fever and is admitted to the hospital. What is the likely diagnosis: 
Select and explain. 
A. Systemic Lupus Erythematosis, B. Chloasma, C. Steven Johnsons syndrome, D. Lyme disease
A: Systemic Lupus Erythematosis
Answer: A: Systemic Lupus Erythematosis 
Explanation: Symptoms of Systemic Lupus Erythematosis (SLE) include butterfly shaped malar rash which is sensitive to sunlight, painful joints, low-grade fever, fatigue, mouth ulcers, anorexia, weight loss, lymphadenopathy, enlarged spleen and alopecia. SLE affects females more than males to a ratio 8:1. It commonly affects the non-white women of the child bearing age. Pregnancy could precipitate symptoms for the first time. Ref: Neuroimmune Pharmacology, By Howard E. Gendelman, Tsuneya Ikezu, 2008, Page 288