Which of the following plants is used for treating fungal infections and scabies?

Akapulko, also known as Cassia alata, is recognized for its antifungal properties, making it effective in treating conditions such as fungal infections and scabies. The leaves of Akapulko contain compounds that can inhibit the growth of fungi and are traditionally used in various herbal remedies for skin conditions.

Tsaang Gubat, Amplaya (bitter melon), and Niyog-niyogan do possess various health benefits and are used in traditional medicine, but they are not primarily noted for their effectiveness against fungal infections and scabies like Akapulko is. Tsaang Gubat is known for its digestive benefits, Amplaya is often utilized for its blood sugar-lowering effects, and Niyog-niyogan is used to expel intestinal worms rather than treat topical fungal conditions. Therefore, Akapulko stands out as the appropriate choice for the treatment indicated in the question.