Assertion (A): The characteristic feature of the intestine of earthworm is the presence of internal median fold of dorsal wall called typhlosole.
Reason (R): Typhlosoles are also found in the frog's intestine.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.