Which of the following statements regarding ulcers is true?
a. Helicobacter pylori is a bacterium that lives in stomach acid and causes stomach ulcers.
b. Stress is the primary cause of ulcers.
c. Spicy foods and an unhealthy diet are the primary causes of ulcers.
d. Ulcers are uniquely genetic and stress has nothing to do with the symptoms of ulcers.
Answer: a