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: Social & Preventive Medicine
Phrenoderma is repoedly caused due to deficiency of: 
Select and explain. 
A. Vitamin D, B. Vitamin A, C. Essential Fatty Acid, D. Retinoic acid
C: Essential Fatty Acid
Answer: C: Essential Fatty Acid 
Explanation: Essential fatty acid deficiency may lead to Phrenoderma. It is characterized by rough and dry skin characterised by horny papular eruptions in the posterior and lateral aspects of limbs and back. Ref: Park, 21st Edition, Page 573.