read the following passage and answer the following questions.
Polychlorinated Biphenyls (PCBs) are a special type of waste that are found throughout the world in water, sediments, bird tissues, and fish tissue. They are made by substituting 1 to 10 chlorine atoms onto the biphenyl aryl structure. They have very high chemical, thermal, and biological stability, low vapour pressure, and high dielectric constants. These properties have led to the use of PCBs as coolant insulation fluids in transformers and capacitors; for the impregnation of cotton and asbestos; as plasticizers; and as additives to some epoxy paints. However, the very same properties have contributed to their widespread dispersion and accumulation in the environment. But, some degree of biodegradation of PCBs in the environment does occur. Substitutes of PCBs for electrical applications have been developed. Disposal of PCBs from discarded electrical equipment and other sources have caused problems, particularly since PCBs can survive ordinary incineration by escaping as vapours through the smokestack. However, they can be destroyed by special incineration processes.

Identify the correct statements regarding PCBs:

(A) They are used in electrical equipment.

(B) They can be found in biological samples.

(C) They are non-biodegradable.

(D) They cannot be destroyed through incineration.

Options:

Correct option is A

Statement (A): Correct. The passage explicitly states that PCBs are used in electrical equipment as coolant fluids in transformers and capacitors.
Statement (B): Correct. The passage mentions that PCBs are found in biological samples such as sediments, bird tissues, and fish tissues due to their environmental accumulation.
Statement (C): Incorrect. While PCBs are resistant to biodegradation, the passage acknowledges that some degree of biodegradation does occur. Thus, they are not entirely "non-biodegradable."
Statement (D): Incorrect. PCBs can be destroyed through special incineration processes, as explicitly mentioned in the passage.
Information Booster: 1. PCBs were extensively used in electrical insulation and industrial applications before being banned in many countries.
2. They are highly persistent in the environment, leading to bioaccumulation and biomagnification.
3. PCBs are classified as probable human carcinogens by the International Agency for Research on Cancer (IARC).
4. Effective destruction of PCBs requires temperatures above 1200°C to prevent the formation of dioxins.
5. PCBs can travel long distances through air and water currents, contributing to global pollution.