Which of the following statements about tissues is correct? MCQ with Answer and Explanation

Explanation:
The hypothalamus is a small region in the forebrain that maintains homeostasis by regulating body temperature, hunger, thirst, sleep, and emotions. It also controls pituitary gland secretions. The cerebellum coordinates movement, medulla controls respiration and heart rate, pons relays signals. Hypothalamus acts as the body's thermostat and the link between nervous and endocrine systems.

Explanation:
Hydra, a freshwater cnidarian, has extraordinary regenerative ability; even small fragments can regenerate a complete organism. This is due to its high proportion of stem cells. Planarians also show remarkable regeneration. Earthworms can regenerate some posterior segments, but not as extensively as Hydra or Planaria.

Explanation:
Bacille Calmette-Guérin (BCG) is a live attenuated vaccine against tuberculosis. It is given at birth in many countries. Oral polio vaccine (OPV) for polio.