Final answer:
According to ICH guidelines, an Institutional Review Board (IRB) should have at least 3 members.
Step-by-step explanation:
The Institutional Review Board (IRB) is a committee that reviews proposals for research involving human participants. According to ICH (International Council for Harmonisation of Technical Requirements for Pharmaceuticals for Human Use) guidelines, an IRB should have at least 3 members. These members typically include administrators, scientists, and community members who ensure that proper guidelines and ethical considerations are followed in the research.