The two main classes of porphyrias, according to symptoms, are?

• A. Neurologic and cutaneous
• B. Erythropoietic and hepatic
• C. Congenital and acquired
• D. Hematologic and muscular

Answer: (A)

The main concept being tested is how porphyrias are classified based on clinical presentation. Porphyrias fall into two broad symptom-based groups: those with neurologic (neurovisceral) involvement and those with cutaneous (skin) manifestations. Acute porphyrias typically cause abdominal pain, nausea, vomiting, and neurologic or psychiatric symptoms due to neurovisceral effects. In contrast, cutaneous porphyrias produce photosensitivity with blistering, fragility, and scarring in sun-exposed skin. So, neurologic and cutaneous are the two primary symptom-based categories.

The other groupings describe different ways to categorize porphyrias—by the site of excess production (erythropoietic in bone marrow versus hepatic in the liver) or by etiology (congenital versus acquired)—which reflect origin rather than the dominant clinical symptoms, so they don’t define the symptom-based classification.