You will be given a definition of a task first, then some input of the task.
Indicate a text span in the passage about which an inquisitive question is asked. (note, don't answer the question).

Sentence: Less robust earnings at Pfizer Inc . and Upjohn Co . were attributed to those companies ' older products , many of which face stiffening competition from generic drugs and other medicines .<sep>Question: which products?
Output:
older products ,