Four different treatments were trialled in a human volunteer over the course of a year. One of the treatments was a vaccine. The treatments were injected into the volunteer, and blood samples were collected after two weeks. These samples were then analysed to find the cell count for four types of cell. The results are shown in the table. (Assume that the volunteer's baseline blood cell count was the same before each treatment.) Which treatment was the vaccine?
- Amonocytes 250, neutrophils 180, plasma cells 450, macrophages 230
- Bmonocytes 500, neutrophils 190, plasma cells 220, macrophages 240
- Cmonocytes 260, neutrophils 450, plasma cells 240, macrophages 250
- Dmonocytes 250, neutrophils 190, plasma cells 230, macrophages 550