You will be given a definition of a task first, then some input of the task.
In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.

Question: Pseudomonas aeruginosa is typically: 
 Options:  <1> Sensitive to most antibiotics used in human medicine. <2> Pathogen obligated. <3> Opportunistic pathogen. <4> Commensal bacteria of the digestive tract. <5> Intracellular pathogen.
Output:
3