This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunization, Subject name: Pediatrics
[{'content': 'Which of the following is called first immunization of the baby? \nSelect and explain. \nA. Colostrum, B. Handing over the baby to mother, C. OPV, D. DPT + BCG', 'role': 'user'}, {'content': "Answer: A \nExplanation: a. Colostrum(Ref: Ghai 8/e p 192)Colostrum is rich in immunoglobulins & other substances that protect the baby against infections; So, Colostrum is called the 'First immunization' of the baby.", 'role': 'assistant'}]