<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 4-year-old boy is brought to the emergency department with difficulty breathing. His mother reports that he developed a fever last night and began to have trouble breathing this morning. The boy was born at 39 weeks gestation via spontaneous vaginal delivery. He is unvaccinated conscientious objection by the family and is meeting all developmental milestones. At the hospital, his vitals are temperature 39.8C 103.6F, pulse 122min, respiration rate 33min, blood pressure 11066 mm Hg, and SpO2 93 on room air. On physical examination, he appears ill with his neck hyperextended and chin protruding. His voice is muffled and is drooling. The pediatrician explains that there is one particular bacteria that commonly causes these symptoms. At what age should the patient have first received vaccination to prevent this condition from this particular bacteria?? A: At birth, B: At 2-months-old, C: At 6-months-old, D: Between 9- and 12-months-old, E: Between 12- and 15-months-old,  <response>: Based on the description of a 4-year-old boy with fever, breathing difficulty, hyperextended neck, drooling, and muffled voice, this is likely a case of epiglottitis caused by Haemophilus influenzae type B Hib. The question asks at what age the patient should have received vaccination against the bacteria that commonly causes these symptoms. Hib vaccine is recommended as a 3-dose primary series at 2, 4, and 6 months of age, with a booster at 12-15 months. Therefore, the first vaccination against Hib should be given at 2 months of age.B: At 2-months-old 