Final answer:
To diagnose gigantism, essential sources include growth chart, medical book, patient's family history, and patient's diet, with the patient's diet being the least directly relevant.
Explanation:
growth chart, medical book, patient's family history, and patient's diet are all essential sources for diagnosing gigantism. However, the patient's diet would be the least helpful in making that diagnosis as it is less directly related to the condition compared to the other sources.
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