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What can be said about the grain size of pegmatite?

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What can be said about the grain size of pegmatite?

(a) Fine grained

(b) Medium grained

(c) Fine to medium grained

(d) Coarse grained

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This interesting question is from Important Igneous Rocks topic in section The Study of Rocks of Engineering Geology

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Right answer is (d) Coarse grained

The best explanation: Pegmatites are exceptionally coarse-grained igneous rocks formed from hydrothermal solutions emanating from magmas that get cooled and crystallized in cavities and cracks around magmatic intrusions.

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