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: Medicine
All of the following are true regarding whooping cough except - 
Select and explain. 
A. Spread by droplet infection, B. 90% of cases occur in children under 5 years of age, C. The whoop stage is more infection than catarrhal stage, D. Blood count shows lymphocytosis
C: The whoop stage is more infection than catarrhal stage
Answer: C: The whoop stage is more infection than catarrhal stage 
Explanation: None