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: Pediatrics
A most common cause of Neonatal Hypothyroidism is 
Select and explain. 
A. Throid dysgenesis, B. Transplacental maternal thyroid antibodies, C. Inherited genetic disorders, D. Decreased thyroglubin
A: Throid dysgenesis
Answer: A: Throid dysgenesis 
Explanation: Iodine deficiency is the commonest cause of congenital hypothyroidism in certain parts of India, while thyroid dysgenesis is the most common aetiology in non-endemic areas (75% of all cases).