Ranitidine is utilized for what primary condition?

Ranitidine is primarily used to treat conditions related to excess stomach acid production. It belongs to a class of medications known as H2-receptor antagonists, which work by reducing the amount of acid that the stomach produces. This makes it effective for managing symptoms associated with acid-related conditions, such as gastroesophageal reflux disease (GERD) and peptic ulcers.

By selecting this option, it directly reflects the primary purpose of ranitidine, which is to alleviate problems caused by acid in the stomach. The other options pertain to gastrointestinal issues but do not accurately represent the specific action of ranitidine. Diarrhea, constipation, and nausea and vomiting have different underlying mechanisms and would typically require other treatments rather than an acid-reducing medication like ranitidine.