Five people are in the hospital. Each patient has only one illness, and each person has a different illness. Each person occupies a separate room; room numbers are 101–105.

The person with asthma is in Room 101.
Ms. Jones has a heart disease.
Ms. Green is in Room 105.
Ms. Smith has tuberculosis.
The woman with mononucleosis is in Room 104.
Ms. Thomas is in Room 101.
One of the patients, other than Ms. Anderson, has gall bladder disease.
Question: What illness does Ms. Anderson have and in what room is she? Describe how you arrived at this answer.