Which of the following is NOT a major cause of Peptic Ulcers?

The major causes of peptic ulcers include factors that directly influence the stomach lining and its acid production. Helicobacter pylori is a bacterium known to infect the stomach lining and is a well-established cause of peptic ulcers due to its ability to create an environment where acid can cause damage to the stomach or duodenum. ASA, or acetylsalicylic acid (commonly known as aspirin), is a nonsteroidal anti-inflammatory drug (NSAID) that can irritate the stomach lining and increase acid secretion, leading to ulcer formation. Cigarette smoking also plays a significant role in the development of peptic ulcers, as it contributes to increased acid production and can impair the healing process of existing ulcers.

In contrast, animal dander is not associated with peptic ulcer development. While allergies or sensitivities to animal dander may cause respiratory or skin issues, they do not have an impact on the gastrointestinal tract or the factors that lead to peptic ulcers. This distinguishes it from the other options, which are all linked to ulcer formation through various medical mechanisms.