This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition, Subject name: Pediatrics
In infants and toddlers, craniotabes is a sign related to the deficiency of __________ 
Select and explain. 
A. Vitamin A, B. Vitamin C, C. Vitamin D, D. Vitamin K
C: Vitamin D
Answer: C: Vitamin D 
Explanation: Craniotabes is one of the earliest manifestations of rickets.It is due to thinning of outer table of the skull and detected by pressing firmly over the occiput or posterior parietal bones.A ping-pong-ball sensation is felt. Page 185,Nelson textbook of pediatrics 16th edition