EXPLANATION:

HeLa cell is a cell type in an immortal cell line used in scientific research. It is the oldest and most commonly used human cell line. The line was derived from cervical cancer cells taken in 1951 from Henrietta Lacks (HeLa), a patient, who eventually died of cancer.

Therefore, option B is correct.

EXPLANATION:

Opium is the name for the latex produced within the seed pods of the opium poppy, Papaver somniferum, which belongs to Papaveraceae. The plant is believed to have evolved from a wild strain, Papaver setigerum, which grows in coastal areas of the Mediterranean Sea. Through centuries of cultivation and breeding for opium, the species somniferum evolved. Today, P. somniferum is the only species of Papaver used to produce opium. Opium contains morphine, codeine, noscapine, papaverine, and thebaine. Heroin is an opiate, produced from morphine.

Therefore, option B is correct.

EXPLANATION:

Schistosoma, is commonly known as blood flukes. These are parasitic flatworms responsible for a highly significant group of infections in humans termed schistosomiasis. After infection, the cercaria enters into the liver and blood where they become an adult and migrate into the intestine where female lays an egg. These eggs then expelled out through urine or feces. The miracidium is liberated from the egg and penetrates the intermediate host snail tissues.

Therefore, option A is correct.

EXPLANANTION:

ELISA, which stands for Enzyme-Linked Immunosorbent Assay, is used to detect HIV infection. If an ELISA test is positive, the Western blot test is usually administered to confirm the diagnosis. 

There are three types of HIV tests: antibody tests, antigen/antibody tests, and nucleic acid tests (NAT). Antibody tests look for antibodies to HIV in a person's blood or oral fluid. Antibody testscan take 23 to 90 days to detect HIV after exposure.

Therefore, option B is correct.

EXPLANATION:

The type of antibodies produced during allergy are IgE type. IgE mediates the immediate hypersensitivity reactions and also acts as a mediator in allergic response.

Therefore, option A is correct.

EXPLANATION:

Antibodies present in colostrum is IgA which is also known as secretory immunoglobin. It is present in the mucosal lining of the gastro-intestinal tract, the respiratory system and the urino-genital tract. It role is to prevent pathogenic infection in these systems. 

Therefore, option B is correct.