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
Liver is darkly pigmented in 
Select and explain. 
A. Dubin Johnson syndrome, B. Gilbert syndrome, C. Rotor syndrome, D. Crigler - Najar syndrome
A: Dubin Johnson syndrome
Answer: A: Dubin Johnson syndrome 
Explanation: Dubin Johnson syndrome
Autosomal recessive
Liver darkly pigmented.