The correct option is
B Medulla oblongata-temperature regulation
The cerebrum is composed of right and left hemisphere. The function of cerebrum include initiation and coordination of movement, temperature, touch, vision, memory, problem solving, reasoning, learning. Therefore, option A is matched.
Medulla oblongata responsible for regulating function of autonomic nervous system including respiration, cardiac function, vasodilation and reflexes like vomiting, laughing, sneezing and swallowing. Medulla oblongata does not take part in temperature regulation. So option B is mismatched.
Cerebellum responsible for voluntary movement and maintain equilibrium. So, option C is matched.
Cranial nerves conveys special sensory information related to smell to the olfactory region of the brain. So option D is also matched.
So, the correct answer will be option B.