Biology

Oncology is the branch of medicine that specializes in the study and treatment of cancer. Therefore, the correct answer is 'Cancer'.

Inhaled air passes through the larynx, pharynx, trachea, and finally reaches the bronchioles last before entering the alveoli for gas exchange. Therefore, the bronchiole is the last structure among the options through which air passes.

AB- is the rarest blood type among the common ABO and Rh blood groups, occurring in less than 1% of the population, making it rarer than O-, O+, and AB+.

White blood cells are called the 'soldiers' of the body because they defend the body against infections and foreign invaders, playing a crucial role in the immune system.

The average human brain weighs approximately between 1.2 to 1.4 kilograms, which corresponds to option A. Other options list weights that are significantly higher than the typical brain weight.

Osmoregulation in humans is primarily carried out by the kidneys, which regulate the balance of water and electrolytes in the body by filtering blood and producing urine.

The adult human brain typically weighs about 2% of the total body weight, which is a well-established fact in human biology and anatomy.

Bioluminescence is the term used to describe the emission of light by living organisms, such as fireflies and certain marine animals. The other options do not specifically refer to light emission by living organisms.

Vitamin C deficiency causes scurvy, a disease characterized by symptoms like bleeding gums and weakness. The other options are unrelated to vitamin C deficiency.

Segmented worms, such as earthworms, breathe through their moist skin, which allows the exchange of gases directly with the environment. They do not have lungs, mouths, or noses for respiration.