We usually use when having a conversation with others left h
     We usually use  when having a conversation with others.  left hemisphere  right hemisphere  both left and right  (blank) 
  
  Solution
a. Left hemisphere
Humans have two brain hemispheres and these left brain and a right brain are separated into two distinct cerebral hemispheres and are found to be connected by the corpus callosum.
But two sides resemble each other and but performs different function and it is the left hemisphere, which is involved in language processing that is the reason why we use left hemisphere while involving in a conversation.
So, we can conclude that the left hemisphere deals with the analytical thought (rules, discipline, written, spoken, hearing, logic, abstraction) whereas the right hemisphere will be useful for softer aspects of life (feelings, emotions, visualizing, sensitivity etc)

