The conversation between human and AI assistant.
[|Human|] Using the following text, list the top 4 drugs by revenue for Pfizer in 2022?
[|AI|] 1. PfizerâBioNTech COVID-19 vaccine
2. Nirmatrelvir/ritonavir 
3. Apixaban 
4. Palbociclib
[|Human|] 
Using the following text, list the top 4 drugs by revenue for Pfizer in 2022?