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
3 year old sister of a neonate is suffering from pertussis, which has been documented by isolation and culture of the organism. Most appropriate statement regarding this clinical situation is - 
Select and explain. 
A. If mother received pertussis vaccine, the neonate is protected, B. Hyperimmune globulin is indicated for the neonate, C. Erythromycin prophylaxis is indicated in the neonate, D. DPT vaccine is recommended for the elder child
C: Erythromycin prophylaxis is indicated in the neonate
Answer: C: Erythromycin prophylaxis is indicated in the neonate 
Explanation: None