Final answer:
Excessive odor in an ileostomy patient can be caused by certain foods, with eggs being a likely culprit. Yogurt and cranberry juice are less likely to cause offensive odors, and smoking is indirectly related to ileostomy concerns.
Step-by-step explanation:
When a patient with an ileostomy complains about excessive odor, several factors could be the cause. Considering dietary influences on odor, the consumption of certain foods can alter the smell of output from an ileostomy. While yogurt is generally considered good for gut health and unlikely to cause offensive odors, other foods like eggs can cause a more pungent smell. Smoking has been linked to an increased risk of diseases such as Crohn's, but it is less likely to be the direct cause of odor in ileostomy output. On the other hand, cranberry juice is not typically associated with causing unpleasant odors and may even help to reduce them. Therefore, the information that would best reveal a cause for the excessive odor would be that the patient eats eggs for breakfast every morning (option c).