This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: HAEM synth and porphyrias, Subject name: Biochemistry
All of the following porphyria are inherited in autosomal dominant mode, EXCEPT: 
Select and explain. 
A. Porphyria cutanea tarda, B. Congenital erythropoietic porphyria, C. Protoporphyria, D. Acute intermittent porphyria
B: Congenital erythropoietic porphyria
Answer: B: Congenital erythropoietic porphyria 
Explanation: Porphyrias are either inherited or acquired. All inherited porphyrias follow autosomal dominant mode, EXCEPT: Congenital erythropoietic porphyria which is inherited in Autosomal Recessive mode X-linked protoporphyria/sideroblastic anemia.