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
[{'content': 'Which of the following was a pa of expanded programme of immunization ? \nSelect and explain. \nA. Hepatitis B, B. Rubella, C. Peussis, D. Mumps', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Peussis In may 1974, the WHO officially launched a global immunization programme, known as expanded programme of immunization (EPI) to protect all children of the word against six vaccine-preventable diseases by the year 2000.", 'role': 'assistant'}]