Question 2

Allison and Honjo began their most recent collaborative research in the 2000s.

Allison and Honjo's most recent collaborative research efforts, which have significantly advanced the field of cancer immunology, began in the 2000s. Their international collaborations over the last ten years have particularly reignited interest in immunotherapy.

A) 1970s

This option is incorrect as there is no mention of any collaborative research efforts between Allison and Honjo during the 1970s. Their significant contributions and collaborations are noted to have occurred much later.

B) 1980s

The 1980s is also incorrect since the text does not indicate that their collaborative research started during this decade. Their impactful work in immunology became more prominent in the following decades.

C) 2000s

This option is correct as it aligns with the context that states their recent collaborative research initiatives began in the 2000s. This period marks a revitalization of their efforts in immunotherapy.

D) 1990s

The 1990s is incorrect because it predates the timeline given for their collaborative work. The focus of their most recent efforts, as stated, is in the 2000s.

Conclusion

The correct answer, the 2000s, is supported by the information provided in the extract, which specifies that Allison and Honjo's collaborative research efforts are recent and have evolved significantly over the past decade. The other options fail to accurately represent the timing of their collaborative work, which is pivotal to understanding their contributions to cancer immunology.