diff --git a/aiogram/api/client/bot.py b/aiogram/api/client/bot.py
index 5a78e589..ce12de07 100644
--- a/aiogram/api/client/bot.py
+++ b/aiogram/api/client/bot.py
@@ -1214,7 +1214,7 @@ class Bot(ContextInstanceMixin["Bot"]):
         allows_multiple_answers: Optional[bool] = None,
         correct_option_id: Optional[int] = None,
         explanation: Optional[str] = None,
-        explanation_parse_mode: Optional[str] = None,
+        explanation_parse_mode: Optional[str] = UNSET,
         open_period: Optional[int] = None,
         close_date: Optional[Union[datetime.datetime, datetime.timedelta, int]] = None,
         is_closed: Optional[bool] = None,
diff --git a/aiogram/api/methods/base.py b/aiogram/api/methods/base.py
index 1ad41445..dfdfda34 100644
--- a/aiogram/api/methods/base.py
+++ b/aiogram/api/methods/base.py
@@ -56,8 +56,9 @@ class TelegramMethod(abc.ABC, BaseModel, Generic[T]):
         a model initialization from `Bot.method_name`, so we must take care of it and
         remove it before fields validation.
         """
-        if "parse_mode" in values and values["parse_mode"] is UNSET:
-            values.pop("parse_mode")
+        for parse_mode_attribute in {"parse_mode", "explanation_parse_mode"}:
+            if parse_mode_attribute in values and values[parse_mode_attribute] is UNSET:
+                values.pop(parse_mode_attribute)
         return values
 
     @property
diff --git a/aiogram/api/methods/send_poll.py b/aiogram/api/methods/send_poll.py
index 0868d0b2..b716a9c8 100644
--- a/aiogram/api/methods/send_poll.py
+++ b/aiogram/api/methods/send_poll.py
@@ -9,6 +9,7 @@ from ..types import (
     Message,
     ReplyKeyboardMarkup,
     ReplyKeyboardRemove,
+    UNSET,
 )
 from .base import Request, TelegramMethod, prepare_parse_mode
 
@@ -44,7 +45,7 @@ class SendPoll(TelegramMethod[Message]):
     explanation: Optional[str] = None
     """Text that is shown when a user chooses an incorrect answer or taps on the lamp icon in a
     quiz-style poll, 0-200 characters with at most 2 line feeds after entities parsing"""
-    explanation_parse_mode: Optional[str] = None
+    explanation_parse_mode: Optional[str] = UNSET
     """Mode for parsing entities in the explanation. See formatting options for more details."""
     open_period: Optional[int] = None
     """Amount of time in seconds the poll will be active after creation, 5-600. Can't be used