Consider the given four statements and select the option containing the two correct ones out of these.
(a) Avirulent live bacteria cannot be used for preparation of vaccines against plague.
(b) Interferons are synthesized in response to viruses.
(c) A metastatic cancerous tumour is termed ‘sarcoma’ if the disorder is in fibroblasts.
(d) Alzheimer disease in humans is associated with the deficiency of glutamic acid.
The two correct statements are:
1. (a) and (b)
2. (b) and (c)
3. (c) and (d)
4. (a) and (c)