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
A 30 years old lady was brought to the hospital with strong labour pains for the last 3 hours and no progress. She was found to have pelvic deformities which lead to cephalopelvicdisproportion. The baby was delivered by a cesarean section. The woman is likely to have suffered from the deficiency of 
Select and explain. 
A. Vitamin D, B. Vitamin B, C. Vitamin C, D. Vitamin A
A: Vitamin D
Answer: A: Vitamin D 
Explanation: None