This is from a British film. In a farm, two friends are working heavily and finally they removed an old and dried tree trunk from the soil and then took a break, sitting on the ground and drinking something. And they are talking as follows:
A: Did you plant that tree?
B: My father planted it.
I wonder why B did not answer "No", "No, I did not" or something to that effect, but instead he answered "My father planted it".
A did not actually ask "Who planted it". A simply wanted to find out "Did you plant that tree?", which means "Did you do it(planting) in the past?.
If there is no problem with B's answer -or A's question-, how did B know that A actually meant "Was it you who planted that tree?", although his question did not seem to be trying to find out about it.
I got confused.