How many statements are incorrect ?
(i) α-interferons can act as biological response modifiers.
(ii)` I_gM` antibody are found in pentamer form.
(iii)Down syndrome amy be due to abnormal sperm.
(iv)Contact inhibition is property present in cancer cells,.
| A. |
4 |
| B. |
3 |
| C. |
2 |
| D. |
1 |
 |