Study the given relationships carefully and select the option which correctly identifies P-S.
(i) Pistia : Hydrilla : : Wolffia : P
(ii) Pigeon : Ostrich : : Sparrow : Q
(iii) Chickenpox : Tetanus : : Mumps : R
(iv) Wildebeest : Snake : : Deer : S
| P | Q | R | S | |
| A | Waterhyacinth | Emu | Malaria | Rhinoceros |
| B | Tap grass | Rhea | Tuberculosis | Lion |
| C | Lotus | Parrot | Typhoid | Fox |
| D | Water lily | Vulture | Anaemia | Bear |