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: Pharmacology
Excessive intake (hypervitaminosis) of which of the following vitamin is associated with increased risk of congenital malformations - 
Select and explain. 
A. Vitamin-A, B. Biotin, C. Folic acid, D. Vitamin-K
A: Vitamin-A
Answer: A: Vitamin-A 
Explanation: Ans. is 'a' i.e., Vitamin A o It is absolutely contraindicated in pregnancy, as it is highly teratogenic; upto 25% exposed foetuses had bih defects-craniofacial, hea, and CNS abnormalities.