Assertion (A): There are no medicines to cure the common cold. Reason (R): Over time, disease-causing bacteria and virus become drug resistant.

• Both (A) and (R) are true, and (R) is the correct explanation of (A).
• Both (A) and (R) are true, but (R) is not the correct explanation of (A).
• (A) is true, but (R) is false.
• (A) is false, but (R) is true.