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What is the hormone secreted by the isles of Langerhans in the pancreas?

  1. a. Infectious disease

  2. b. Insulin

  3. c. Instinct

  4. d. Ingestion

The correct answer is: b. Insulin

Insulin is the hormone secreted by the isles of Langerhans in the pancreas. The option "Infectious disease" (A) is incorrect because an infectious disease is not a hormone. Similarly, "Instinct" (C) and "Ingestion" (D) are incorrect because they are not hormones secreted by the isles of Langerhans in the pancreas.