This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: New born infants, Subject name: Pediatrics
Newborn infants are administered vitamin K at bih at a dose of ______ 
Select and explain. 
A. 0.5-1 mg IM, B. 5-10 mg IV, C. 1-5 mg IV, D. 0.1-0.5 mg IM
A: 0.5-1 mg IM
Answer: A: 0.5-1 mg IM 
Explanation: All newborn infants are to be administered vitamin K at a dose of 0.5 - 1 mg intramuscularly, to prevent hemorrhagic disease of newborn (HDN) However, for newborns with vitamin K deficiency, the dose of vitamin K administered is 1- 5 mg Intravenously. Ref: Nelson textbook of pediatrics 21st edition Pgno: 873