Let's match the diseases with their respective medicinal decoctions:
- Surameha (obesity) is treated with Nimba Kashaya (decoction of Nimba). Thus, (A) matches with (III).
- Sikatameha (urinary problems) is treated with Chitraka Kashaya. Thus, (B) matches with (II).
- Udakameha (water retention) is treated with Parijata Kashaya. Thus, (C) matches with (I).
- Ikshumeha (diabetes) is treated with Kalhara Kashaya. Thus, (D) matches with (IV).
Thus, the correct matching is (A)
-(III), (B)
-(II), (C)
-(I), (D)
-(IV).