Argyrol is a:
(A) Ferric oxide sol
(B) Silver sol
(C) Gold sol
(D) Arsenic sol

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Hint: Silver is used in medicines as it has antimicrobial and antibiotic effects. This is because silver has low toxicity and minimum risk when used at wound or bacterial infection.

Complete step-by-step solution:
Argyrols is also known as mild silver protein that acts as a strong antimicrobial to kill the bacteria without harming body tissues. It is used as an antiseptic for eye inflammation and Gonorrhoea infections.
Barnes and Hill Chemists company incepted this drug and promoted it exclusively as the colloidal silver protein has an antiseptic use to mucous membranes. Nowadays it is prepared at industrial scale using a combination of denatured pharmaceutical-grade protein and elemental silver.

Hence, the correct option is (B).

Additional Information: Sol is a colloid in which the dispersed phase is solid and dispersion medium is liquid. Colloids can be understood as an aggregate of very fine tiny particles dispersed in a continuous medium.

Note: use of colloidal silver in excess is unsafe for the human body. It gets deposited into various organs and leads to an irreversible bluish skin. It can also affect melanin production in our skin and might cause some allergy.