This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S., Subject name: Pediatrics
Ebstein anomaly is due to - 
Select and explain. 
A. Lithium, B. Cu, C. Co, D. Ni
A: Lithium
Answer: A: Lithium 
Explanation: Ans. is 'a' i.e., Lithium o Ebstein anomalyDownward displacement of an abnormal tricuspid valve into right ventricle.Due to lithium exposure in intrauterine life.