Alcohol is a gastric irritant because it can cause many problems in gastrointestinal tract. Drinking alcohol can trigger production of more acid in the stomach which can cause burning sensation. It can also cause gastritis in which inflammation of lining of stomach occurs. Ulcers, the open sores in stomach lining can also occur due to acid in stomach. Drinking too much alcohol can cause reflux of acidic gastric juices in the oesophagus which cause a burning sensation and this condition is called heartburn.
So, the correct answer is 'Gastric irritant'.
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