A.

allergy 

Allergy is the hypersensitiveness of a person to some foreign substances coming in contact with or entering the body. The common allergens are dust, pollen mould, spores, fabricates, bacteria, etc. During an allergic reaction, there is increased the release of histamine from mast cells. Use of antihistamines and from mast cells. Use of antihistamine and steroids give a quick relief from allergy.

D.

Heroin accelerates body functions

Malignant tumour first grows slowly. No symptoms are noticed. This stage is called the latent stage. The tumour later grows quickly. The cancer cells go beyond adjacent tissue and enter the blood and lymph. Once this happens, they migrate to many other sites in the body, where the cancer cells continue to divide. It is metasis. Only maligant tumours are properly designated as cancer.

A.

Late blight of potato - Alternaria solani

The causative agent of late blight of potato is fungus Phytophthora infestans, class- Oomycetes, order- Peronosporales, family-pythaiceae. In India, the late blight of potato is a seed born disease.

C.

acetylcholine

Alzheimer disease in humans is associated with the deficiency of acetylcholine.Alzheimer's Disease (AD) is an irreversible, progressive disorder, in which brain cells (neurones) deteriorate, resulting in the loss of cognitive functions, primarily memory judgement and reasoning, movement coordination and pattern recognition. In advanced stages of the disease, all memory and mental functioning may be lost.

B.

common cold, AIDS

Common cold and AIDS are viral diseases, occur due to myxovirus and Human Immunodeficiency Virus and Human Immunodeficiency Virus (HIV) respectively.
The causative agents of ringworm disease are fungi Trichophyton and Microsporum.
Typhoid and tuberculosis are bacterial diseases caused by salmonella typhi and mycobacterium tuberculosis respectively.