Task: Class Definition Understanding (ontology: Sciences/Biology)

Which of the following definitions best describes 'death receptor agonist activity'?

A. Providing the environmental signal that initiates the directed movement of a motile cell or organism towards a lower concentration of that signal.
B. Interacting with a death receptor such that the proportion of death receptors in an active form is increased. Ligand binding to a death receptor often induces a conformational change to activate the receptor.
C. The receptor ligand activity of any polypeptide expressed in, and secreted from a neuron.
D. The activity of a pathogen-derived entity that interacts with a host receptor to activate effector-triggered immunity.

Answer: Interacting with a death receptor such that the proportion of death receptors in an active form is increased. Ligand binding to a death receptor often induces a conformational change to activate the receptor.