Instructions: Given a scientific passage and an answer, generate a question for the given answer.
Input: Passage: Hypersecretion by an endocrine gland is often caused by a tumor. For example, a tumor of the pituitary gland can cause hypersecretion of growth hormone. If this occurs in childhood, it results in very long arms and legs and abnormally tall stature by adulthood. The condition is commonly known as gigantism (see Figure below ). Answer: pituitary gland
Output:
A tumor of what gland can cause hypersecretion of growth hormone?