下列何種試劑主要適用於觀察皮屑、指甲或毛髮中是否有黴菌菌絲體?
10% \mathrm{H}_{2}\mathrm{O}_{2}
\mathrm{H}_{2}
\mathrm{O}_{2}
10% carbolfuchsin
10% KOH
10% methylene blue