Step 1: Understanding the Question:
This question tests knowledge of medicinal uses of tree fruits.
Step 2: Detailed Explanation:
The fruits of Syzygium cumini (jamun) are known for controlling diabetes.
They have hypoglycemic properties.
Tamarindus indica (A): Not for diabetes.
Emblica officinalis (B): For immunity.
Artocarpus heterophyllus (D): Jackfruit (not for diabetes).
Thus, the correct answer is Syzygium cumini.
Step 3: Final Answer:
Thus, Syzygium cumini fruits are known for controlling diabetes, which corresponds to option (C).
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