The answer is the third one (c): Polydipsia.
Explanation for each option:
a. Diarrhea: This is not typically associated with type 1 diabetes. Diarrhea can be a symptom of various gastrointestinal issues but is not a common symptom prior to a diagnosis of type 1 diabetes.
b. Anorexia: While changes in appetite can occur with diabetes, anorexia (loss of appetite) is not a classic symptom of type 1 diabetes. In fact, individuals with undiagnosed type 1 diabetes often experience increased hunger (polyphagia).
c. Polydipsia: This is a classic symptom of type 1 diabetes. Polydipsia refers to excessive thirst, which occurs because high blood sugar levels lead to increased urination (polyuria), causing dehydration and triggering thirst.
d. Weight gain: This is not typically associated with type 1 diabetes. In fact, weight loss is more common prior to diagnosis due to the body's inability to use glucose for energy, leading it to break down fat and muscle instead.
Summary: Polydipsia, or excessive thirst, is a common symptom reported prior to a diagnosis of type 1 diabetes.